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Image transmission in an OFDM VLC system using symbol scrambling and chaotic Walsh-Hadamard precoding

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Optoelectronics Letters 2019年第4期15卷 284-287页

作者： WANG Zhong-peng YE zhuo-ying WANG Xiu-min ZHAI Zhi-nian School of Information and Electronic Engineering Zhejiang University of Science and Technology Hangzhou 310023 China Xiamen City University Xiamen 361008 China College of Information Engineering China Jiliang University Hangzhou 310038 China

An image secure transmission scheme combining symbol scrambling and chaotic Wahsh-Hardmard precoding is proposed in orthogonal frequency division multiplexing(OFDM)-based visible light communication(VLC) *** the proposed scheme, a two-dimensional(2 D) logistic-sine-coupling map(LSCM) is employed to generate two chaotic sequences. One is used to scramble the 16 quadrature amplitude modulation(QAM) symbols, and the other is used to scramble the rows of standard Walsh-Hadamard transform(WHT). The simulation results show that the proposed scheme can not only reduce the peak-average-power ratio(PAPR) but also achieve the image secure transmission over OFDM-based VLC systems.

关键词： OFDM VLC LSCM QAM

Effect of casting methods on microstructure and mechanical properties of ZM5 space flight magnesium alloy

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China Foundry 2018年第6期15卷 418-421页

作者： Xu-liang Zhang Guo-kang Yu Wen-bing Zou Yan-shuo Ji ying-zhuo Liu Jia-lin Cheng Shanghai Spaceflight Precision Machinery Institute Shanghai 201600China School of Materials Engineering Nanjing Institute of TechnologyNanjing 211167China

The counter-gravity casting methods have been developed to remove the casting defects of Mg based alloys. However, the effects of different counter-gravity casting methods on the microstructure and mechanical properties have not been studied in detail. ZM5 alloys were prepared by gravity casting, low-pressure casting and counter-pressure casting, respectively. The mechanical properties, microstructure and fracture morphologies were examined and compared by means of optical microscopy, scanning electron microscopy methods and tensile testing. Results show that casting defects such as gas pore, shrinkage porosity and cavity can be eliminated by counter-pressure casting. The grain size of α-Mg is decreased significantly by counterpressure casting. Moreover, the precipitated particles are more uniform and finer in the counter-pressure casting sample. As a result, the mechanical properties of the alloys are greatly improved. The tensile strength and elongation of the samples by counter-pressure casting are 285 MPa and 13.9%, respectively, which are much higher than those of the low pressure casting and gravity casting.

关键词： counter-pressure casting ZM5 alloy microstructure mechanical properties

An Analysis on Proxemics Phenomenon Between China and America

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Journal of Literature and Art Studies 2017年第10期7卷 1320-1325页

作者： KE zhuo-ying LIAN Yu Xi'an Shiyou University Xian Shaanxi China

International culture communication is a new discipline which arouses people＇s attention and becomes more and more popular among the researchers from different countries. A comparative study of proxemics phenomenon between China and America finds that those two countries have a great differences. American seems especially sensitive to their body spaces, and Chinese don＇t care much about it. In the book The Silence Language, Edward hall first uses the term proxemics, and he has given a detailed analysis of proxemics. Proxemics is the study of spatial distances between individuals in different cultures and situations. Cultural factors for proxemics has a great influence, and the factors such as gender and religion also has a profound significance on proximics. This thesis will mainly analyze this phenomenon in the way of the definition and theory ofproximics, especially, the ways how people deal with the international culture situation. In order to improve the readers cultural accomplishment and ability to communicate, prevent the errors in the protocol, this paper will further explain how to solve these cross-cultural problems in cross-cultural context, especially for Chinese learners. With some fresh insights into international culture communication research, hopefully the readers may benefit from this paper and communicate with foreign people in a better way.

关键词： proximics phenomenon across culture international communication

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胫腓双骨折内固定是否固定腓骨的比较

中国矫形外科杂志 2024年第11期32卷 979-984页

作者：陈尚桐陈跃平黄川洪董盼锋章晓云卓映宏黄柯琪李加根广西中医药大学广西南宁530001 广西中医药大学附属瑞康医院创伤骨科广西南宁530001

[目的]比较胫腓双骨折开放复位内固定术是否固定腓骨的临床疗效。[方法]回顾性分析2018年1月—2020年1月广西中医药大学附属瑞康医院创伤骨科收治的54例胫腓骨双骨折患者的临床资料,依据术前医患沟通结果,29例固定腓骨,25例不固定腓骨... 详细信息

[目的]比较胫腓双骨折开放复位内固定术是否固定腓骨的临床疗效。[方法]回顾性分析2018年1月—2020年1月广西中医药大学附属瑞康医院创伤骨科收治的54例胫腓骨双骨折患者的临床资料,依据术前医患沟通结果,29例固定腓骨,25例不固定腓骨。比较两组围手术期、随访和影像资料。[结果]所有患者均顺利完成手术,术中无相关并发症发生。固定组手术时间[(112.4±13.3)min vs(81.0±11.2)min,P<0.001]、切口总长度[(7.0±1.3)cm vs(4.9±1.2)cm,P<0.001]显著长于未固定组,但前者术中透视次数[(3.0±0.9)次vs(5.1±1.4)次,P<0.001]、术后首次触地时间[(8.4±1.4)d vs(24.9±3.0)d,P<0.001]均显著少于后者。所有患者获得随访,随访时间12~18个月。固定组恢复完全负重活动时间显著早于未固定组[(22.1±1.3)周vs(23.4±1.0)周,P<0.001]。与术后3个月相比,末次随访时,两组VAS、HSS、AOFAS评分及踝背伸-跖屈ROM均显著改善(P<0.05)。末次随访时,固定组VAS[(0.2±0.3)vs(1.3±0.8),P<0.001]、HSS[(88.8±0.7)vs(87.3±2.1),P<0.001]、AOFAS[(91.3±6.6)vs(79.7±14.0),P<0.001]评分及膝伸-屈ROM[(134.9±5.5)°vs(126.2±6.1)°,P<0.001]、踝背伸-跖屈ROM[(58.1±8.4)°vs(44.2±10.4)°,P<0.001]均优于非固定组。影像方面,固定组的骨折复位优良率显著高于未固定组(P<0.05),固定组的影像骨折愈合时间显著早于非固定组(P<0.05)。[结论]对胫腓骨双骨折开放复位内固定中,固定腓骨临床结果更优,是一种可行的方法。

关键词：胫骨腓骨骨折骨折固定术腓骨固定腓骨不固定

TiO_(2)-Fe_(2)TiO_(5)heterostructure hollow spheres enable high-performance lithium-sulfur batteries via interfacial engineering

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Rare Metals 2024年第8期43卷 4006-4012页

作者： Kai-Tao Liu Hong-Qiang Wang zhuo Chen Shi-Lin Zhang ying-ying Song Fang Liu Qiao-Ling Li Jiao Li School of Materials Science and Engineering Shandong University of TechnologyZibo 255049China College of Chemistry&Environmental Science Hebei UniversityBaoding 071002China School of Chemical Engineering Faculty of SciencesEngineering and TechnologyUniversity of AdelaideAdelaide 5005Australia School of Materials Science and Engineering Hebei University of TechnologyTianjin 300130China

The shuttle effect of lithium polysulfides between sulfur cathode and lithium anode is a notorious problem in the commercial application of lithium-sulfur ***,heterostructured TiO_(2)-Fe_(2)TiO_(5)hollow spheres were ... 详细信息

关键词： lithium sulfide (5)

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金刚石钻进能量在风化花岗岩地层中的变化特征

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岩土工程学报 2007年第9期29卷 1303-1306页

作者：谭卓英北京科技大学金属矿山高效开采与安全教育部重点实验室

利用钻进过程监测系统在风化花岗岩地层中的试验数据对钻进系统的动能、轴力功、黏滞能耗及钻进总能量进行了分析。研究表明,钻具系统的动能在钻进能量中占主导地位,轴力功与黏滞能耗所占的比重很低,钻具系统的动能以及钻进总能量与岩... 详细信息

利用钻进过程监测系统在风化花岗岩地层中的试验数据对钻进系统的动能、轴力功、黏滞能耗及钻进总能量进行了分析。研究表明,钻具系统的动能在钻进能量中占主导地位,轴力功与黏滞能耗所占的比重很低,钻具系统的动能以及钻进总能量与岩石的风化程度呈负相关,轴力功与岩石的风化程度呈正相关,说明钻进能量与岩石风化程度具有很好的响应关系。最后,从破碎单位体积能耗的观点出发,分析了钻进比功与岩石风化程度之间的关系。研究表明,在全风化及强风化花岗岩地层中,金刚石旋转钻进比功值明显低于冲击凿碎比功;在微风化的坚硬与极坚硬岩石中,金刚石旋转钻进比功则明显高于冲击凿碎比功。这为金刚石旋转钻进中岩石的实时分级与实时判层提供了新的方法。

关键词：钻进能量动能钻进比功风化花岗岩实时判层

Amorphous core-shell NiMoP@CuNWs rod-like structure with hydrophilicity feature for efficient hydrogen production in neutral media

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Chinese Journal of Catalysis 2024年第8期63卷 154-163页

作者： Jiayong Xiao Chao Jiang Hui Zhang zhuo Xing Ming Qiu ying Yu College of Physical Science and Technology Central China Normal UniversityWuhan 430079HubeiChina

Using interface engineering,a highly efficient catalyst with a shell@core structure was successfully synthesized by growing an amorphous material composed of Ni,Mo,and P on Cu nanowires(Ni-MoP@CuNWs).This catalyst only requires an overpotential of 35 mV to reach a current density of 10 mA cm^(-2).The exceptional hydrogen evolution reaction(HER)activity is attributed to the unique amorphous rod-like nature of NiMoP@CuNWs,which possesses a special hydrophilic feature,en-hances mass transfer,promotes effective contact between the electrode and electrolyte solution,and exposes more active sites during the catalytic *** functional theory revealed that the introduction of Mo weakens the binding strength of the Ni site on the catalyst surface with the H atom and promotes the desorption process of the H_(2)product *** to its facile syn-thesis,low cost,and high catalytic performance,this electrocatalyst is a promising option for com-mercial applications as a water electrolysis catalyst.

关键词： Amorphous Three-dimensional core-shell Electrodeposition Neutral electrolyte Electrocatalyst Hydrogen evolution reaction

Effectiveness of oxygen nebulization at preventing radiotherapy-induced mucositis in patients with nasopharyngeal cancer

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International Journal of Nursing Sciences 2014年第2期1卷 176-179页

作者： Juan Xu Rong Yan Pei-ying zhuo Ran-Ran Li Hong-Xia Ge Wen-Fang Lu Radiology Department Shandong Cancer HospitalJi’nanChina

Purpose:To evaluate the effectiveness of oxygen nebulization at preventing radiotherapyinduced mucositis in patients with nasopharyngeal ***:Sixty patients with nasopharyngeal cancer treated with simultaneous integrated boost intensity-modulated radiotherapy were randomly assigned to oxygen nebulization or ultrasonic nebulization groups;treatment was once daily for 20 *** patients received routine oral *** compared saliva pH and volume,food intake,and change in oral mucosa during radiotherapy,and dry mouth and sore throat after radiotherapy between the two ***:There were significant differences in the incidence of grade III or IV mucositis,saliva volume and pH,and dry mouth and sore throat between the two groups when the total dose was 33 Gy(p<0.05 or p<0.01).Conclusion:Oxygen nebulization reduces radiotherapy-induced mucositis and relieves symptoms such as dry mouth and sore throat in patients with nasopharyngeal cancer.

关键词： Mouth mucosa Oxygen atomization inhalation Radiotherapy Radiation injuries

A Potential Model for Detecting Crowding-induced Epithelial Cell and Cancer Cell Extrusion

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Current Medical Science 2019年第3期39卷 391-395页

作者： Ping HAN Dong-xiao LI Yu LEI Jing-mei LIU Xiang-ming DING Han WANG zhuo-ying LIN Wei YAN De-an TIAN Department of Gastroenterology Tongji HospitalTongji Medical College Huazhong University of Science and Technology Wuhan 430030 China

Overcrowding and cell deformation lead to the shedding of apoptotic and live cells to maintain homeostasis in the epithelium. Recent studies have attempted to explain the effect of extrusion on epithelial homeostasis and tumor metastasis, but lack the requisite quantitative models for testing extrusion. Here, we designed a petri dish inversion model to detect the extrusion ability of both normal epithelial cells and epithelial cancer cells. Firstly, we found cell extrusion was observed in both normal epithelial cells (LO2 cells) and cancer cells;in confluent LO2 cell culture, certain cells were surrounded by their neighbors, suffered "collective attack", and were then made round in shape. Green fluorescent protein (GFP)-labeled cancer cells were also found to be squeezed by normal LO2 cells. Using the petri dish inversion model, we quantified the number of extrusion cells, and demonstrated that the ability of cancer cell extrusion was related to the metastatic potential of cancer cell lines. Our findings provide a novel model to detect crowdinginduced epithelial cell and cancer cell extrusion. This novel model provides a quantitative method for research into apoptotic and cancer cell extrusion, particularly in human hepatocellular carcinoma.

关键词： hepatocellular carcinoma metastasis epithelial homeostasis crowding extrusion