Design for the simulation of space based information network

1 .INTRODUCTIONNewcommunication network si mulations are nee-dedin space based networkto demonstrate ensuingadvances in global operations and distributed re-source management . Theseinclude full-scale si mu-lation of networking, protocols ,information dis-tribution,and display to lead tointegrated demon-strations of full-scale land-,air-,sea-,and space-based network having explicit modelling of net-work dynamics ,inter-satellite links (ISLs) , up-downlinks ( UDLs) ,schedulers ,protocols …     

PRELIMINARY STUDY ON RETRO-REFLECTIVE COATED PAPER BASED ON MICROGLASS BEADS

INTRODUCTIONThe micro-glass bead[1-2] is a new kind of silicate material, with good properties of chemical stability, mechanical strength as well as electro-resistance. When its diameter is below 0.08mm and the reflective index is in the range of 1.9~2.1, retro-reflective characteristics can be achieved. When a beam of ray from any direction irradiates the surface of the micro-glass beads, it can be converged at the special reflective layer consisted of focuses of micro-glass beads, owing …     

Leaching Mechanism of Complicated Antimony-Lead Concentrate and Sulfur Formation in Slurry Electrolysis

Anodic reaction mechanism of complicated antimony-lead concentrate in slurry electrolysis was investigated by the anodic polarization curves determined under various conditions. The main reactions on the anode are the oxidations of FeCln^(2-n) . Though the oxidation of jamesonite particle on the anode can occur during the whole process, it is less. With the help of mineralogy studies and relevant tests, the leaching reaction mechanism of jameson[to and gudmundite during slurry electrolysis was ascertained. Because of the oxidation reaction of FeCl3 produced by antimony-lead concentrate itself, the non-oxidation complex acid dissolution of jameson[re, the oxidation complex acid dissolution of gudmundite, and the oxidation of air carried by stirring, the leaching ratio of antimony reaches about 35% when HCl-NH4Cl solution is used to leach antimony-lead concentrate directly. So when the theoretical electric quantity is given to oxidation of antimony in slurry electrolysis, all of antimony, lead and iron containing in antimony-lead concentrate, are leached. The formation of sulfur is through the directly redox reaction of Fe^3 and jameson[re. The S^2- in jamesonite is oxidized into S^0 , and forms the crystals of sulfur again on the spot. The redox reaction of Fe^3 and H2S formed by non-oxidative acid dissolution of jamesonite is less.     

炼钢生产过程中钢液脱氧方法发展与展望

在传统长流程炼钢生产过程中,为完成脱硅、脱磷、脱碳和升温的任务,需要在转炉中吹入过量氧气,之后在精炼过程中加入合金元素脱氧。这不可避免地在钢液中残留了大量脱氧产物,影响钢的洁净度。随着用户对钢材性能要求的不断提高,降低钢液中的氧含量并保证其高洁净度是十分必要的。经过百余年的发展,钢中的全氧含量已从约100 × 10−6降低到约10 × 10−6,部分对全氧含量要求极为严苛的钢种可控制在5 × 10−6以下。当前已经形成了成熟稳定的钢液脱氧技术,但从另一角度而言,进一步降低钢中的氧含量对于提高钢材质量已不再具有明显作用。本研究团队通过对传统工艺进行全流程优化,开发了非铝脱氧轴承钢生产技术。该技术结合了硅锰预脱氧、LF炉扩散脱氧和真空终脱氧。与此同时,成功进行了采用自然脱碳预脱氧新方法生产IF钢的工业实验。结果表明,非铝脱氧可以将轴承钢中的氧含量控制在4 × 10−6–8 ×1 0−6之间,改变夹杂物的类型,消除了大颗粒Ds类夹杂物,显著改善了钢液的流动性,并获得更高的疲劳寿命。采用自然脱碳预脱氧生产的IF钢降低了吨钢铝耗和生产成本,显著提高了铸坯质量。     

Exploration of TCM Masters Knowledge Mining

Traditional Chinese medicine （TCM） has a rich knowledge about human health and disease by its special way evolved along a very long history. As modern medicine is achieving much progress, arguments and disputes toward TCM never end. To avoid losing precious knowledge of living TCM masters, endeavors have been engaged to systematic collection of those knowledge of TCM masters, such as their growth experiences, effective practical cases toward diseases and typical therapeutic principles and methods. Knowledge mining methods have been expected to explore some useful or hidden patterns to unveil some mysteries of the TCM system. In the paper, some computerized methods are applied toward those collected materials about some living TCM masters in China mainland to show a different way of exposing essential ideas of those TCM masters by correspondence visualization which aims to help people understand TCM holistic views toward disease and body, and facilitate tacit knowledge transfer and sense-making of the essence of TCM. The work is one kind of qualitative meta-synthesis of TCM masters＇ knowledge.     

在日常活动区中幼儿合作意识的培养策略——托班活动区的实践与收获

在社会对人才的要求逐步提高以及素质教育不断深入的形势下,教师应利用幼儿集体相处于幼儿园这个特殊环境的时机,采用适宜的方法,加强幼儿合作意识与合作能力的培养,以便他们以后能更好地适应社会。我院通过组织实施"托班幼儿合作能力培养"的实验研究,旨在探索培养幼儿从小具有合作精神,具有一定合作技能的有效途径。     

Fast Carrier Selection of JPEG Steganography Appropriate for Application

In recent years,the improvement of the security of steganography mainly involves not only carrier security but also distortion function.In the actual environment,the existing method of carrier selection is limited by its complex algorithm and slow running speed,making it not appropriate for rapid communication.This study proposes a method for selecting carriers and improving the security of steganography.JPEG images are decompressed to spatial domain.Then correlation coefficients between two adjacent pixels in the horizontal,vertical,counter diagonal,and major diagonal directions are calculated.The mean value of the four correlation coefficients is used to evaluate the security of each JPEG image.The images with low correlation coefficients are considered safe carriers and used for embedding in our scheme.The experimental results indicate that the stego images generated from the selected carriers exhibit a higher anti-steganalysis capability than those generated from the randomly selected carriers.Under the premise of the same security level,the images with low correlation coefficients have a high capacity.Our algorithm has a very fast running speed,and the running time of a 2048×2048 image is less than 1 s.     

浅述大体积砼产生裂缝的控制

文章针对大体积砼产生裂缝的控制,论述了钢筋砼承受变形应力的特点。     

模糊互补滤波的AGV视觉惯性里程计

为提高自动导引车(automated guided vehicle,AGV)在复杂视觉环境下的定位性能、降低硬件成本,提出了一种基于AprilTag和模糊互补滤波的视觉惯性里程计(visual-Inertial Odometry,VIO).采用扩展卡尔曼滤波器(extended Kalman filter,EKF)融合陀螺仪、磁力计和编码器测量数据,计算航向角用于航位推算.通过对相机AprilTag识别距离和运动速度进行模糊推算获取标识权重,加权计算AprilTag进行视觉定位,减小多标识视觉定位误差.通过标识权重均值计算互补融合系数,将视觉定位和航位推算结果互补融合,提高VIO定位精度.实验结果表明,所提出的VIO在小型AGV的定位精度达到了 41.84 mm,比惯性里程计和传统卡尔曼滤波的AprilTag-VIO分别提高了 52.20％和20.75％.