The Economic Effect of Mineral Resources Exploitation in Bijie Prefecture in Guizhou

The exploitation of mineral resources plays an important role in promoting national economic development. Mining is an essential component of China＇s industrial economy. Using grey correlation method to analyze the correlative effect of mineral resources exploitation to relevant industries, using national income method to calculate the pulling effect of mineral resources exploitation to economic growth and using graphs as well as tables to analyze the income distribution effect, the article obtains active economic effect of mineral resources development in Bijie, Guizhou. Moreover, from the view of resources-cored effect, the article analyzes negative effects such as single industrial structure brought by mineral resource development. Through analysis, we find that mineral resources exploitation to some extent brings active effects including gross domestic product growth, local financial revenue growth and relevant industries development; however, its negative effects should not be ignored. The negative effect can be lightened by diversifying industrial structure and prolonging industrial chain.     

基于Kalman滤波理论的矿山企业伤亡事故预测

结合矿山企业伤亡事故统计的特点，在充分掌握用于伤亡事故预测方法的基础上，选择基于Kalman滤波理论构建矿山企业千人负伤率预测模型，并对该模型的具体算法进行了改进。以我国某矿山的千人负伤率统计数据为例对该模型进行验证。结果表明，该模型预测精度较高，预测效果比较理想，不失为一种有效的预测方法。     

活性炭纤维固相微萃取-气质联用色谱测定废煤气脱硫剂中的萘

采用活性炭纤维固相微萃取-气质联用色谱法测定废煤气脱硫剂中的萘含量,探讨了萃取方式、萃取时间、萃取温度、解吸条件对萃取效率的影响.结果表明,最优萃取条件为40℃下顶空萃取10 min,260℃下解吸2 min.最优萃取条件下,检测方法的线性范围为200～870 mg/L,相关系数为0.998,检测限为10 ng/L.利...     

机器人技术在地震废墟搜索救援中的应用

破坏性地震往往会造成大量人员被掩埋在建筑废墟内,因此,被困人员的搜索救援是地震现场应急工作的重要任务。地震现场的搜索效率直接关系到地震救援工作的成功率,是提高被困人员生命存活率的重要因素。但是,强震发生后,地震现场往往余震频发、废墟内环境危险而又复杂,这些都给救援人员带来了极大的困难,也威胁着救援人员的生命安全。结合当前快速发展的搜救机器人技术研究现状以及地震应急救援中遇到的实际问题,提出了地震救援装备机器人化的研究设想,目的是提出地震救援人员对辅助搜索救援机器人的实际需求。同时介绍了中国地震应急搜救中心与国内多家院所合作完成的地震现场搜索救援机器人系列的研究现状,并分析了其优势与不足。所做的工作可为提高现场搜索救援效率,以及地震救援机器人的进一步研发与产业化参考。     

Desulphurization of coal via low temperature atmospheric alkaline oxidation

Different from other options which usually required strict conditions, a method combining atmospheric oxidization and chemical cleaning with alkali solutions was employed to desulphur coals at temperature around 90 degrees C. The data show that 66% organic sulphur, 44% sulphide sulphur, and 15% pyrite sulphur were lost when the coal was treated in 0.25M NaOH at 90 degrees C, while the solution being aerated at the flow rate of 0.136m3h(-1). The rate increased to 73% for organic sulphur, 83% for sulphide sulphur and 84% for pyrite sulphur when the previous coal was further treated in acidic solution containing HCl at pH 1 for another hour. The mechanism of desulphurization was explored using inductively coupled plasma mass spectrometry, X-ray photoelectron spectroscopy and infrared. It was found out that the bond of -CS was broken by atmospheric oxygen in basic environment, leading to the lost of organic sulphur in coal. Scanning electron microscope data show that the physical structure of the coal was not adversely affected by the treatment and thermogravimetric analysis results prove that the pyrolysis behavior remained unchanged, indicating that the burning process of the coal would not be adversely affected. Unlike other oxidizing methods, this technique does not lower the heating value of the coal which was manifested by relevant data.     

谈项目安全管理现状

随着我国国力的不断增强，交通建设投资加大，公路建设驶入了发展的快车道。对于各类建设施工企业特别是公路桥梁施工企业来说，面临千载难逢的发展机遇。然而，就在所有施工企业拼尽全力拿项目，上项目的同时，一个不容忽视的问题也随之产生。那就是熟练工人的严重缺乏，农民工的大量涌入和无序流动，加上管理水平降低，管理力量薄弱，     

双转盘反应器光催化处理罗丹明B

采用溶胶—凝胶法制备的TiO2/Ti电极为光阳极,Cu、Fe、Zn或C为阴极,组成双转盘反应器,以罗丹明B(RhB)为目标污染物,考察了反应条件对光催化效率的影响.结果表明,最佳反应条件:阴极材料为Cu;转盘转速为70 r/min;初始pH为2.5；Na2SO4质量浓度为1.0 g/L; RhB初始质量浓度为20 mg/L.在最佳反应条件下,处理RhB模拟废水30 min的脱色率可达到99.9％.双转盘反应器处理不同浓度的RhB时,其脱色率是单转盘的1.12～2.33倍,且倍数随着RhB浓度增大而增加,表明双转盘反应器可高效地光催化处理高浓度染料废水.     

中国对外贸易的经济增加值—隐含碳排放失衡问题研究

在欧盟碳边境调节机制等贸易碳壁垒层出不穷的国际贸易新形势下,我国对外贸易亟待破解低经济附加值和高碳排放双重压力。本研究运用双边贸易隐含排放分析模型,通过构建贸易碳生产率和贸易失衡度指标,从国家整体、双边贸易和三次产业三个层面,定量揭示了1995—2019年我国对外贸易中的碳排放和经济损益失衡现象。结果表明,2019年贸易净增加我国国内碳排放9.3亿吨。其中,中美和中欧贸易碳逆差分别为2.5亿吨和1.6亿吨。第二产业贸易导致9.8亿吨碳排放净流入我国,第一产业和第三产业贸易分别引发0.4亿吨和0.2亿吨碳排放净流出我国。2019年我国出口贸易整体碳生产率为1.0欧元/千克碳,约为全球平均值的一半;我国出口贸易失衡度为1.9,承担了相较于自身出口经济收益占比近两倍的碳排放责任。在我国三次产业中,仅第一产业出口贸易的碳生产率高于全球平均值、失衡度小于1.0。我国已成为国际转移排放的“污染避难所”,亟须通过采取持续强化绿色低碳技术自主创新、增加三产贸易占比、增强国内大循环主体作用等措施,应对更趋复杂的贸易和气候变化争端。     

Exploring the impact of new particle formation events on PM2.5 pollution during winter in the Yangtze River Delta, China

New particle formation（NPF） events are an increasingly interesting topic in air quality and climate science. In this study, the particle number size distributions, and the frequency of NPF events over Hefei were investigated from November 2018 to February 2019. The proportions of the nucleation mode, Aitken mode, and accumulation mode were 24.59%,53.10%, and 22.30%, respectively, which indicates the presence of abundant ultrafine particles in Hefei. Forty-six NPF events occurred during the obser...