In this paper, we consider an energy-constrained unmanned aerial vehicle (UAV)-enabled mobile relay assisted secure communication system in the presence of a legitimate source-destination pair and multiple eavesdroppers with imperfect locations. The UAV employs power splitting (PS) scheme to simultaneously receive information harvest energy from source, then exploits time switching (TS) protocol perform relaying. Furthermore, full-duplex destination node which can confidential signals...

This paper investigates a dual-unmanned aerial vehicle (UAV)-enabled secure communication system, in which, UAV moves around to send confidential messages mobile user while another cooperative transmits artificial noise signals confuse malicious eavesdroppers. Both UAVs have energy constraints and the location information of eavesdroppers is imperfect. We consider worst-case secrecy rate maximization problem over all time slots. optimization solved by jointly designing three-dimensional (3D)...

Based on the pharmacokinetics theory, this study investigated pharmacokinetic characteristics of albiflorin, paeoniflorin, wogonoside, and wogonin in normal febrile rats summarized absorption elimination rules Dayuanyin them to provide reference for further development clinical application Dayuanyin. Blood samples were taken from fundus venous plexus model after intragastric administration at different time points. The concentration each substance blood was determined by ultra performance...

This paper investigates an energy-constrained relay-assisted secure communication system in the presence of a legitimate source-destination pair and passive eavesdropper with imperfect channel state information (CSI). The relay exploits power splitting (PS) protocol to simultaneously harvest energy decode from received signal source, then forwards confidential full-duplex (FD) destination while it transmits artificial noise (AN) confuse eavesdropper. robust beamforming design is developed by...

Extreme loadings, a hostile environment and dangerous operation lead to the unsafe state of bridges under construction, especially large-span bridges. Global Navigation Satellite Systems (GNSS) tend be best choice for real-time deformation monitoring due significant advantage automation, continuation, all-weather high precision. Unfortunately, traditional geodetic GNSS instrument with its price large volume is limited in applications. Hence, we design develop low-cost equipment by...

The Loess Plateau is one of the three most severely affected geological disaster areas in China. Water sensitivity significant feature loess. Under action continuous heavy rainfall, rainwater infiltrates loess, resulting a rapid increase soil saturation and changes moisture. This affects shear strength induces shallow loess landslides. Therefore, it to our country’s prevention mitigation efforts effectively monitor deformation inducement such At present, global navigation satellite system...

This paper investigates the wireless communication with a novel architecture of antenna arrays, termed modular extremely large-scale array (XL-array), where elements an large number/size are regularly mounted on shared platform both horizontally and vertically interlaced modules. Each module consists moderate/flexible number inter-element distance typically in order signal wavelength, while different modules separated by relatively inter-module for convenience practical deployment. By...

For real-time (RT) precise point positioning (PPP), the state space representation (SSR) information is often delayed due to possible communication delays and specific broadcast intervals. In this case, results will diverge re-converge increase of SSR products extrapolation errors. addition, RT orbit clock offset accuracy, as well their errors, vary in different systems satellites. We propose a PPP with ambiguity resolution (PPP-AR) method that combines time-differenced carrier phase (TDCP)...

In this paper, we investigate the near-field modelling and analyze beam focusing pattern for modular extremely large-scale array (XL-array) communications. As XL-array is physically electrically large in general, accurate characterization of amplitude phase variations across its elements requires non-uniform spherical wave (NUSW) model, which, however, difficult performance analysis optimization. To address issue, first present two ways to simplify NUSW model by exploiting unique regular...

Time-domain algorithms have significant performance advantages for missile-borne synthetic aperture radar (SAR) focusing with diving movement. However, due to the curve trajectory of missile platform, range and angular histories target become very sensitive unknown tomography, which provides difficulties SAR algorithm development. To address this problem, we proposed a new fast factorized back-projection (FFBP) reduced topography sensibility focusing. The was designed based on an orthogonal...

内陆水体是全球碳循环的关键组成部分，是大气中甲烷（CH₄）的重要来源，每年从内陆淡水与自然湿地排放进入大气的CH₄约为185~357 Tg/a.通常，内陆水体中CH₄主要由分布于水层底部的厌氧区或沉积层内的产甲烷菌介导产生，其向水层表面传输的过程中易被甲烷氧化菌所氧化.甲烷氧化菌可分为好氧甲烷氧化菌和厌氧甲烷氧化菌，有氧条件下，由好氧甲烷氧化菌介导的好氧甲烷氧化过程是水体中甲烷氧化过程的主要形式，湖泊底部产生的CH₄总量中约有99%可以被上覆水体中的好氧甲烷氧化过程所消耗.本文收集文献综合分析阐明，好氧甲烷氧化过程是由水环境因子、水文条件以及不同内陆水体的生态系统特征共同调控，同时也表现在了好氧甲烷氧化菌的生境偏好上.复杂的调控过程构建了内陆水体向大气输送CH₄的动态平衡，并最终反映在内陆水体对全球CH₄循环、碳循环作出的贡献上.;Inland waters are important parts in global carbon...

Abstract We present a new Global Navigation Satellite Systems (GNSS) positioning approach that utilizes low-rate Virtual Reference Station (VRS) data to achieve high-rate displacement monitoring. The method integrates tightly the VRS technology with asynchronous Real-Time Kinematic (RTK) overcome limitation of in structural health monitoring (SHM) applications. When this is used, no local reference station required so efforts and cost setting up stations can be avoided. Experiments datasets...

With the rapid development of Internet and update iteration electronic products, augmented reality technology is widely used in military, medical, education, entertainment other fields. Compared with traditional AR technology, WebAR can efficiently run on web browsers various systems be without additional APP. achieves advantages a light-weight, easy spread cross-platform. these digital means, way human-computer interaction presentation also changing each passing day. It gradually being...

The suffix "mén" is used to refer schools or sects in the traditional context, and recently "X-mén" has become a buzzword on Internet which refers groups who share common affection. To figure out reasons for semantic change, this paper adopts corpus-based method analyze linguistic characteristics high-frequent collocation words of "X-mén". analysis shows that old new meanings have lot similarities terms words. Using co-occurrences metaphor theory, explains mechanism change about how are...

This paper presents a remote affective interactive design: Telepathy Lamp, which focuses on the "Empty Nest" problem. It is device for parents and children who live far away from each other, focusing transferring emotional communication based metaphor of ambient media. consists two lamps, one parents, other children. The lamps can detect presence users send signal to lamp through network. Then side would turn on. makes families have conscious that they're companied by away. promotes...

In this paper, we investigate the near-field modelling and analyze beam focusing pattern for modular extremely large-scale array (XL-array) communications. As XL-array is physically electrically large in general, accurate characterization of amplitude phase variations across its elements requires non-uniform spherical wave (NUSW) model, which, however, difficult performance analysis optimization. To address issue, first present two ways to simplify NUSW model by exploiting unique regular...