1960-2015年两广地区夏季高温热浪变化特征

基于两广地区44个气象站夏季日最高气温资料,运用相关性分析、IDW插值等方法,研究了1960-2015年两广地区夏季高温热浪变化趋势.结果表明：（1）近56 a,两广地区高温日、高温热浪频次、强高温热浪频次均呈增加趋势,其中广东省增长率远高于广西壮族自治区.（2）在空间上,高温日数南部少北部多,由沿海向内陆递增;危害高温日从东南沿海向西北内陆递增;强高温热浪频次自2省交界处向四周递减,且沿海地区较低,内陆较高.（3）在空间变化上,高温日变化率以增加趋势为主,且自桂平-罗定-广宁-罗宁-广州-增城-连平一带向四周递减;危害高温日变化率自罗定-高要-广宁-八步-连州一带向四周递减;广东省高温热浪变化率增加趋势更为明显;强高温热浪变化率由罗定-广宁-连州一线向四周递增.（4）两广高温热浪事件与西藏高原指数、印缅槽强度指数相关性较强,高温热浪事件在广西壮族自治区与广东省具有显著的正相关性.     

西藏种子植物新记录

报道了西藏种子植物3个新记录属： 爵床科（Acanthaceae）的十万错属（Asystasia Bl.）、千屈菜科（Lythraceae）的萼距花属（Cuphea Adans.ex P.Br.）、毛茛科（Ranunculaceae）的星果草属（Asteropyrum Drumm.et Hutch.）和相对应的3个新记录种： 白接骨（Asystasia neesiana（Wall.） Nees）、香膏萼距花（Cuphea alsamona Cham.et Schlechtend.）和裂叶星果草（Asteropyrum cavaleriei（H.Lév.et Vaniot） Drumm et Hutch.）,以及西藏种子植物1个新记录种： 柳叶菜科（Onagraceae）丁香蓼属（Ludwigia L.）的细花丁香蓼（Ludwigia perennis L.）.凭证标本保存于西藏高原生态研究所标本室（XZE）.十万错属、萼距花属、星果草属和细花丁香蓼在西藏自治区范围内为首次发现,进一步丰富了种子植物的地理分布信息,同时也完善了西藏种子植物属、种的多样性组成.     

Smart Sensors

The term “Smart Sensors” refers to sensors which contain both sensing and signal processing capabilities with objectives ranging from simple viewing to sophisticated remote sensing, surveillance, search/track, weapon guidance, robotics, perceptronics and intelligence applications.

Recently this approach is achieving higher goals by a new and revolutionary sensors concept which introduced inside the sensor some of the basic functions of living eyes, such as dynamic stare, non-uniformity compensation, spatial and temporal filtering.

New objectives and requirements are presented for this type of new infrared smart sensor systems.

This paper is concerned with the front end of FPA microbolometers processing, namely, the enhancement of target-to-noise ratio by background clutter suppression and the improvement in target detection by “smart” and pattern correlation thresholding.     

众核处理架构在水下航行器相位编码脉冲回波检测中的应用

针对宽带编码脉冲、多输入多输出等新型目标探测体制发展带来的运算量和数据存储需求剧增的问题,根据水下航行器相位编码脉冲回波检测算法的数据级并行特点,提出应用图形处理器(Graphics Processing Unit,GPU)众核处理架构,并从任务分配策略、数据处理流程、GPU硬件资源利用率和存储器访问等角度考虑,设计了算法在GPU上的并行实现框架。利用湖试数据测试了桌面级GPU平台、嵌入式GPU平台与基于多核数字信号处理器(Digital Signal Processor,DSP)的传统航行器信号处理平台的性能,与多核DSP平台相比,嵌入式GPU平台在功耗、运算性能等方面更有优势。研究结果表明采用嵌入式GPU平台可大幅提升每瓦特性能指标并简化系统设计,能满足新型航行器探测系统大数据量、低功耗和实时性的应用需求。     

Binary integer modeling of the traffic flow optimization problem,in the case of an autonomous transportation system

Our research aimed to optimize the transportation processes through the binary integer modeling of cooperative vehicle control by linking the dynamic traffic assignment approach and controlling the autonomous transport system. Our paper’s main contribution is a model transforming the optimal vehicle control problem into binary integer formulation, optimizing transport processes at the system level, and representing safety and dynamics related constraints on the vehicle level. Two small numerical case studies have illustrated the applicability and effectiveness of the model.     

A review of autonomous agricultural vehicles (The experience of Hokkaido University)

Robotic farming will play an undeniably significant role in future sustainable agriculture. Autonomous agricultural vehicles for arable crops and their components are reviewed herein, and their differing possible components, advantages and disadvantages are discussed. The autonomous agricultural vehicles are qualified from technical points of view, including each vehicle's hardware unit (platform development, platform, transporter system, operation functions, communication, sensors [positional sensor, attitude sensor, and safety sensor], and control unit), the physical environment, and the control algorithm. The development process for different vehicles is described. As an operational case study, all investigations conducted at Hokkaido University between 1990 and 2018 are discussed and evaluated based on the described classification. The development procedure, the process of component selection, developmental challenges, and the performance indicators of the vehicles are discussed in detail. The development process and applicability of each component are then presented, and recommendations for future studies are noted. Finally, the most important experiences and lessons, and some recommendations are outlined.     

Selection of healing agents for a vascular self-healing application

To increase the durability and reliability of thermosets, self-healing via a vascular network, is developed. A judicious choice of healing agents proves to be necessary to achieve the best recovery of properties. Four low viscosity two-component epoxy-amine healing systems were compared, to check which glass transition temperature range would be best to recover mechanical properties (T_g ranging from −8 to 68 °C). Interdiffusion experiments show that all systems react sufficiently slowly at room temperature to allow interdiffusion of epoxy and amine over more than 1 mm before the diffusion is stopped by vitrification. Swelling tests revealed that most of the selected healing agents diffuse into the surrounding matrix and swell it. This might be beneficial for crack closure and improved adhesion between healing system and matrix. Flexural tests demonstrated that, the higher the glass transition temperature of the fully cured healing system, the higher the healing capability.     

Longitudinal vehicle dynamics control for improved vehicle safety

The aim is to investigate the improvements in vehicle safety that can be achieved by limiting the vehicle speed based on GPS path information. The control strategy is aimed at reducing vehicle speed before a potentially dangerous situation is reached, in contrast with widely used stability control systems that only react once loss of control by the driver is imminent. An MSC.ADAMS/View simulation model of an off-road test vehicle was developed and validated experimentally. A longitudinal speed control system was developed by generating a reference speed based on the path information. This reference speed was formulated by taking into account the vehicle’s limits due to lateral acceleration, combined lateral and longitudinal acceleration and the vehicle’s performance capabilities. The model was used to evaluate the performance of the control system on various tracks. The control system was implemented on the test vehicle and the performance was evaluated by conducting field tests. Results of the field tests indicated that the control system limited the acceleration vector of the vehicle’s centre of gravity to prescribed limits, as predicted by the simulations, thereby decreasing the possibility of accidents caused by rollover or loss of directional control due to entering curves at inappropriately high speeds.     

Design models for unit load storage and retrieval systems using autonomous vehicle technology and resource conserving storage and dwell point policies

Computationally efficient design conceptualization models are proposed for automated unit load storage and retrieval systems based on autonomous vehicle technology. Vehicle and lift travel times and the probability distribution for 12 service scenarios occurring under realistic operating assumptions are formulated and used to generate expected transaction service times. Additional measures of system performance including transaction waiting time and vehicle utilization are formulated for systems using random storage and point-of-service-completion dwell point rules. The models provide a practical means of predicting key aspects of system performance based on five design variables that drive the majority of system costs. They are illustrated in the context of a conceptualization study adapted from an actual system installation.