Concept of the solar ring mission: An overview

The concept of the Solar Ring mission was gradually formed from L5/L4 mission concept, and the proposal of its pre-phase study was funded by the National Natural Science Foundation of China in November 2018 and then by the Strategic Priority Program of Chinese Academy of Sciences in space sciences in May 2019. Solar Ring mission will be the first attempt to routinely monitor and study the Sun and inner heliosphere from a full 360-degree perspective in the ecliptic plane. The current preliminary design of the Solar Ring mission is to deploy six spacecraft, grouped in three pairs, on a sub-AU orbit around the Sun. The two spacecraft in each group are separated by about 30° and every two groups by about 120°. This configuration with necessary science payloads will allow us to establish three unprecedented capabilities: (1) determine the photospheric vector magnetic field with unambiguity, (2) provide 360-degree maps of the Sun and the inner heliosphere routinely, and (3) resolve the solar wind structures at multiple scales and multiple longitudes. With these capabilities, the Solar Ring mission aims to address the origin of solar cycle, the origin of solar eruptions, the origin of solar wind structures and the origin of severe space weather events. The successful accomplishment of the mission will advance our understanding of the star and the space environment that hold our life and enhance our capability of expanding the next new territory of human.

     

焦炉装煤自动计量系统的应用

焦炉装煤自动计量系统采用软件自动判断和硬件判断2种方式自动识别,系统的应用实现了对焦炉装煤情况的自动计量和统计功能,及对推焦计划、循环检修表的编排、打印管理等功能。     

河北南网循环水泵改造实践与分析

结合河北南网发电厂近几年来循环水泵改造的实践,以3个典型为实例,对改造前、后的性能进行了比较,分析了所存在的问题,并对改造的规范化提出了建议。     

Convective heat transfer characters of nanoparticle enhanced latent functionally thermal fluid

The latent heat of the microencapsulated phase change material (MPCM) increases the effective thermal capacity of latent functionally thermal fluid. However, researchers found that the heat transfer performance of such fluids was diminished due to the reduction of the low thermal conductivity of MPCM. For this reason, the nanoparticle enhanced latent functionally thermal fluids were formulated and the heat transfer behaviors of these fluids in a vertical circular tube at the laminar regime were conducted. The result showed that slurries containing 0.5% TiO₂ nanoparticles by mass and 5%–20% MPCM by mass exhibited improved heat transfer rates in comparison with the conventional latent functionally thermal fluid and that the enhancement increased with the increasing MPCM concentration and up to 18.9% of the dimensionless wall temperature was reduced. Supported by the National Natural Science Foundation of China (Grant No. 50076020)     

The technical research on the huge glazed brick from the relic of Nanyue Kingdom Palace

‘Qin brick and Han tile’ has a great worldwide reputation in the architectural history of China. According to the former archaeological materials, the big hollow brick is usually one meter long and thirty to forty centimeters wide, while the solid brick is generally much smaller. But in 1995, large scale vestiges and structures were unearthed at the center of Guangzhou’s old district, from the relic of Nanyue Kingdom Palace, which was built some 2000 years ago during the Western-Han Dynasty. A great number of earthen structural members were discovered, especially the solid glazed bricks in various beautiful patterns with an astonishing thickness and size. Some of them are one meter square, more than 20 centimeters thick, and weight half a ton, which are named ‘Brick No.1 in the world’ by excavators. People have shown great interest in how to make these huge glazed bricks at the ancient technical conditions, because it is very difficult to manufacture such huge bricks even with the modern technology. At the request of Guangdong Nanyue Kingdom Palace Museum, Shanghai Institute of Ceramics carried out systematical measurements and analysis on these bricks and studied the physical and chemical forming mechanisms from their chemical compositions, structure, and physical characteristics. Here the technical characteristics of the bricks are also discussed. Supported by the National Natural Science Foundation of China (Grant Nos. 50432010, 50572117)     

ЛЗ380—2型给水泵改造后轴瓦振动超标处理

将前苏联ЛЗ380—2型给水泵由半容量增容改造为全容量后，转子刚度相对降低，再循环流量偏小，摩擦付抗咬合性能差，造成泵组在运行不到一个大修周期便出现轴瓦振动超标缺陷。转子热装改造、再循环流量孔板校正、改进摩擦付材质、增加平衡盘平衡能力、提高入口导流器导流能力后改善了全容量给水泵轴瓦振动特性。     

太原东山矿区主要地质环境问题

在航卫片地质解译、野外地质环境调查、地面物探、样品测试的基础上，运用系统分析理论，详细研究了太原东山矿区的地质环境现状，指出了存在的主要地质环境问题，并提出了矿区地质环境的保护建议。     

Tracking and grasping of moving target based on accelerated geometric particle filter on colored image

Visual tracking and grasping of moving object is a challenging task in the field of robotic manipulation, which also has great potential in applications such as human-robot collaboration. Based on the particle filtering framework and position-based visual servoing, this paper proposes a new method for visual tracking and grasping of randomly moving objects. A geometric particle filter tracker is established for visual tracking. In order to deal with the tracking efficiency issue for particle filter, edge detection and morphological dilation are employed to reduce the computation burden of geometric particle filtering. Meanwhile, the HSV image feature is employed instead of the grayscale feature to improve the tracking algorithm's robustness to illumination change.A grasping strategy combining tracking and interception is adopted along with the position-based visual servoing(PBVS)method to achieve stable grasp of the target. Comprehensive comparisons on open source dataset and a large number of experiments on real robot system are conducted, which demonstrate the proposed method has competitive performance in random moving object tracking and grasping.     

河东煤田中段煤炭开采对柳林泉的影响

分析了柳林泉域的周边界线、地层和含水特征,地质构造控水特征,水动力流场,探讨了煤炭开发对柳林泉环境的影响.     

Effect of ball milling and electrolyte on properties of high-voltage LiNi0.5 Mnl.5O4 spinel

Effect of ball milling and electrolyte on the properties of high-voltage LiNi0.5 Mn1.5 O4 was investigated. Ball milling has significant effect on the synthesis and property of LiNi0.5 Mn1.5O4. The X-ray diffraction（XRD） patterns indicate that LiNio.s Mn1.5O4 can＇t be synthesized without ball milling even calcined at 900 ℃. When synthesized with bail milling, LiNi0.5 Mn1.5O4 almost exhibits only one plateau at around 4.7 V. With the increase of ball milling time, the capacity of LiNi0.5Mn1.5O4 increases, but the cycling performance is not highly affected. The electrochemical property of LiNi0.5 Mn1.5O4 highly depends on the electrolyte. The stable and high-voltage-resistant electrolyte is much beneficial to enhancement of electrochemical property of LiNi0.5 Mn1.5O4, such as coulombic efficiency and cycling performance.