Performance Evaluation of Low-Carbon and Clean Transformation of China’s Coal Economy

In China,the oversupply of coal occurred in 2009,and from that year onwards,China’s coal economy began a low-carbon and clean transformation.Evaluating transformation performance is the research goal of this paper.The data collection for this paper includes data on deep processing of Chinese coal products from 2009 to 2020,as well as data on asset structure evolution and financial performance of 34 listed companies in the Chinese coal mining.Entropy value method is used to calculate the entropy value of low-carbon transformation,and the regression analysis is used to study the performance of cleaner transformation,the conclusion is as follows:(1)From 2009 to 2020,in China’s total energy consumption,coal consumption accounted for 71.6%in 2009 and 56.8%in 2020,the goals set by the state have been achieved.(2)The national goal of reducing the proportion of coal consumption and reducing carbon emissions has forced the transformation of deep processing of coal products.The transformation of coal enterprises towards low-carbon and clean production has achieved remarkable results.(3)From 2009 to 2020,the non coal industry income of 34 listed companies in China’s coal mining industry increased by 8.21%annually.At the same time,the asset structure was adjusted,and nearly 80%of the asset structure evolution showed an orderly development trend.(4)The regression analysis results show that the entropy value of coal deep processing products and the entropy value of asset structure adjustment are significantly related to transformation performance.The paper proposes to summarize the successful experience of China’s coal energy economic transformation,lay a foundation for achieving the carbon peak and carbon neutral goals in the future,further increase the intensity of coal deep processing,increase the proportion of clean energy in total energy consumption,and strive to control asset operation towards the goal of increasing the proportion of non coal industry income.

Kinetics Analysis of Pre-Eutectoid Transformation of Austenite in Carbon-Manganese Clean Steel with Rare Earths

By means of rapid cool dilatometry, the influence of rare earths on kinetics of pre-eutectoid transformation of austenite of carbon-manganese clean steel was studied. While the content of rare earths were proper, the nucleation of pre-eutectoid ferrite on the grain boundary of austenite was accelerated and the incubation period of pre-eutectoid transformation was shortened. But while rare earths were excessive, opposite actions appeared. Rare earths decreased transformation velocity constant in the process of transformation from austenite to ferrite, which meant that the growth of per-eutectoid ferrite became slow. The reason above varieties was related to effect of rare earth on grain boundary constitution of austenite and diffusion of carbon element.

Low-carbon transformation of industrial structure in China

The traditional economic growth mode of "three highs and one low(high input, high consumption, high pollution and low effi ciency)" makes China get the achievements of economic development and prosperity during the reform and opening up with more than 30 years, but behind this extensive mode of economic growth is excessive consumption of natural resources and a lot of greenhouse gases emissions, this not only limits the growth rate of China's economy, but makes a tremendous negative impact on the environment which is diffi cult for us to survive. Therefore, realizing industrial structure low-carbon effectively and developing a low-carbon economy characterized by "low-power, low consumption, low pollution and low emissions", become China's new target selection to transform economic development mode and realize the goal of optimization and upgrading of industrial structure and sustainable development.

Clean Energy Fuels Economic Transformation and Development

THE clean energy industry has become an important engine for global economic growth.In the context of the global economic recession and oil price fluctuations brought about by the COVID-19 pandemic,the industry is playing a more significant role in boosting global economic transformation in a green and low-carbon manner.In recent years,China has actively promoted the development of clean energy such as wind and solar power,and formulated plans for such development.The country has seen substantial improvement of the environment as it made great efforts in adjusting the energy mix,transforming the model for economic growth,tackling pollution,restoring the ecology,and promoting a green lifestyle among the general public.

Microstructural Features During Strain Induced Ferrite Transformation in 08 and 20Mn Steels

The microstructure evolution during strain induced ferrite transformation was followed in thermal-simulation tests of clean 08 and 20Mn steels. The influences of carbon equivalence and initial austenite grain size on ferrite grain refinement and the volume fraction of ferrite during straining were inspected. The results revealed that the accelerating effect of ferrite transformation by strain was increased as the carbon equivalence decreased. However, finer ferrite grains were obtained at higher carbon content. At strain of similar to1.5 ferrite grains less than 3 mum and 2 mum can be obtained in 08 and 20Mn steels respectively. Whereas the ferrite grain refinement in 08 steel was due to both effects of strain induced transformation and ferrite dynamic recrystallization, that in 20Mn was mainly due to strain induced transformation. Heavy strain can produce fine ferrite grains in coarse austenite grained 08 steel, but it would lead to band microstructure in coarse austenite grained 20Mn.

Green transformation of manufacturing industry for ecological protection in Jiangsu Province

Under the new normal economy, the manufacturing industry is developing rapidly as the focus of economic development in Jiangsu. Its rapid development has brought great opportunities to our society, but at the same time, great challenges has been brought to the natural environment. The resource consumption and environmental pollution problems have become increasingly prominent. In the face of this situation, we must try every means to reduce pollution and save energy. Therefore, the transition trend of manufacturing industry in the future is bound to take the green economy as the background. Thus, this paper analyzes the drawbacks of the manufacturing industry in Jiangsu province. And the status of traditional manufacturing enterprises and advantages of green manufacturing are analyzed. Then, the paper proposed to explore the practice of green manufacturing mode for the ecological protection, so as to achieve the industrial transformation and upgrading of manufacturing industry in Jiangsu province.

Exploring the “Green” Transformation Planning of Industrial Parks in the Era of Low Carbon Economy

The core function of the low carbon economy is to change the economic development trend of the whole society. It is necessary to carry out industrial transformation and upgrading according to the concept of sustainable development and to realize integrated technological innovation and efficient economic development without violating the law of ecological and environmental development. In the era of the low-carbon economy, industrial parks should solidly promote the green transformation planning process. Relying on the basic logical framework of green transformation of industrial parks, it can build a green development quality evaluation system of industrial parks and formulate a green planning mechanism and green economic cycle development model in line with the background of the low-carbon economy.

亲清政商关系与企业数字化转型

在数字经济时代,数字化转型是企业实现高质量发展的内生要求,而企业的数字化转型离不开政府的引导和支持。基于此,分析检验当前亲清政商关系构建会如何影响微观企业的数字化转型,有助于企业实现高质量发展。利用2016—2020年中国A股传统行业上市公司的年度观察数据研究发现,亲清政商关系对企业数字化转型具有显著的正向影响,即在政商关系越亲清的地区,企业的数字化水平越高,并且这种正向影响在非国有企业中表现得更强。进一步的机制检验表明,亲清政商关系主要通过“市场导向效应”和“资源供给效应”对企业数字化转型发挥积极的促进作用。更具有启发意义的是,主要是政商关系的“亲近化”而不是政商关系的“清白化”助力了企业的数字化转型,而且亲清政商关系能够降低传统政治关联的相关影响。

Literature Review on the Renovation Project of Self-Built Residential Buildings in the South Under the Low-Carbon Background

With the continuous exploration and research of low-carbon buildings in China,combined with foreign theories and practices,there are a few basic theoretical and practical projects for low-carbon construction in major cities of China.However,throughout the entire academic research,there is still no comprehensive and clear guidance for the green and low-carbon research and transformation of rural self-built houses.Therefore,the existing development of low-carbon technology for rural self-built houses has been summarized,and some prospects for the future development of rural self-built houses have been summarized.It is hoped that this will have positive help for future rural low-carbon transformation.

基于改进YOLOv8n-seg的蟹塘水草区域分割与定位方法

目前蟹塘内水草清理以人工作业为主,劳动强度大,作业效率低,自动水草清理船能大幅降低劳动强度,提高作业效率,而确定蟹塘水草分布是规划水草清理船高效作业路径的关键基础。针对无人机采集的蟹塘水草图像中水草与岸边植被相似性高、难以准确区分等问题,该研究提出一种基于改进YOLOv8n-seg的蟹塘水草区域分割与定位方法。改进模型从降低模型大小和提高召回率的角度出发,首先基于RT-DETR(real-timedetectiontransformer)的HGNetv2(hierarchical graph network)轻量化网络结构重设主干特征提取网络,缩减模型体积;其次以Efficient Rep轻量化结构为基准重构颈部网络,在降低参数量的同时增强模型的多尺度特征融合能力;接着在特征提取层引入SegNext注意力机制,加强模型对蟹塘水草区域的敏感度。为了消除模型在识别过程中产生的冗余区域,进一步提高分割精度,采用二值化处理对分割结果进行优化,并结合图像处理算法对水草区域进行面积筛选;经过坐标转换后得到精确水草轮廓经纬度坐标。试验结果表明:改进模型对蟹塘水草具有良好的区分度和分割效果,其参数量和计算量分别为1.49 M和8.4 GFLOPs,召回率和平均精度均值分别为91.5%和95.6%,与原YOLOv8n-seg模型相比,模型体积减小了49.7%,分割速度提升了32.3%。在坐标转换试验中,水草定位精度平均误差为0.22 m,验证了改进模型能够满足蟹塘水草区域分割与定位要求。研究结果为后续水草清理船自动作业路径规划研究提供参考。

基于YOLOv5的零件识别轻量化算法

为了解决现有的基于深度学习的零件识别模型参数量过大、检测速度慢、检测精度低的问题,以YOLOv5模型为基础,提出了结合轻量级网络和Transformer的零件识别算法。首先,设计了一种轻量级主干特征提取网络,以减少网络的参数量和计算量,并提升推理速度;其次,将Transformer模块与C3模块融合构成C3TR模块,以增强小目标的检测能力;最后,引入噪音净化模块,通过过滤噪音来提高零件识别模型的准确率。模型的检测平均准确率和平均召回率分别达到了86.7%和85.5%,相较原模型分别提升了和24.2%和17.4%。实验结果表明,改进后的模型在实现模型轻量化的同时,具有更快的检测速度和更高的识别准确率。

基于数字孪生技术的新型电力系统数字化

随着“双碳”目标的提出,大规模的清洁能源、电力电子设备和新型负荷将接入电力系统,传统的电力系统管理控制模式难以应对双侧随机性、波动性增强等问题,电力系统的安全稳定运行迎来巨大挑战。数字孪生技术作为重要的数字化手段,成为电力系统转型升级新方法。针对新型电力系统内在机理发生的深刻复杂变化,综述了数字孪生的发展历程以及其在电力系统领域的研究现状,并从新型电力系统数字化需求、数字建模方法、数字化平台建设3个层面研究了电力系统数字化转型进程。最终,提出了以数字孪生技术为核心的新型电力系统建模方法和框架。

基于小波变换与IAGA-BP神经网络的短期风电功率预测

为提高风功率预测精度,减轻输出风能波动性对风电并网不利影响,提出了基于WT-IAGA-BP神经网络的短期风电功率预测方法。利用风速分区、3σ准则及拉格朗日插值法清洗风电场历史数据;其次,依据小波重构误差,选择db4小波分别提取风速、风向、历史风功率的不同频率特征信号,并引入改进自适应遗传算法(IAGA)对各序列BP神经网络的初始权值与阈值寻优,使用Sigmiod函数通过适应度值自适应改变交叉概率与变异概率;构建各序列的WT-IAGA-BP模型对短期风功率组合预测。通过仿真分析,并与ELM、IAGA-BP、WT-ELM及WT-LSSVM方法对比,验证该方法具有更高的预测精度和更好的预测性能。

中国经济社会零碳转型策略:增量式改进还是反推式变革

面对全球气候变化引致的生态危机,加快零碳转型进程势在必行。大力发展清洁能源产业,推动化石能源有序减退是零碳转型策略的核心本质,相关工作仍处于起步阶段。文本在论述零碳转型策略的基础上,研判中国经济社会可行的零碳转型策略。研究发现:首先,零碳转型路径在清洁能源供需体系构建的“源、网、荷、储”等方面呈现多元化特征,目标本质是推动清洁能源实现高效地供需匹配。其次,现阶段各界对中国经济社会零碳转型策略的主张,大体可分为基于现有能源供需体系的增量式改进和直接颠覆现有能源供需体系的反推式变革,两者各有利弊,面临的挑战也存在差异。再次,决策者应理性看待零碳转型过程,既不能仅基于传统能源供需体系“缝缝补补”,也不能急于求成,毕其功于一役地推动变革。鉴于当前相关探索仍处于起步阶段,确定转型的具体方向为时尚早,各地需因地制宜,结合多元转型路径发展竞争情况制定零碳转型策略,遵循由量变到质变的客观规律,经历由预期不稳定、多元化的探索向预期稳定、目标确定的变革演变。最后,从长远看,各界应将零碳转型策略纳入经济社会整体性变革中加以思考,以生态文明发展范式变革推进零碳转型,以零碳转型助力生态文明发展范式变革,力求为推动碳中和能源革命提供启示与参考。

考虑多重因素叠加情景的能源清洁低碳转型风险评估

当前中国能源清洁低碳转型主要面临可持续供应、社会性、地缘性、制裁性等4个方面风险。通过建立能源清洁低碳转型的风险评估模型,按照“两两叠加、三三叠加、全部叠加”的组合方式,排列出11种风险因素叠加情景,基于层次分析法,研判了能源清洁低碳转型中各类情景出现的概率及造成的影响程度,据此提出电网企业作为服务能源清洁低碳转型和构建新型电力系统的骨干企业,应适度超前加强电网建设和调节性资源开发,推动构建面向能源清洁低碳转型的风险预警、政策动态评估以及关键原材料和“卡脖子”技术研发储备机制,重点防范双内生风险和双外部风险影响。

自清洁材料的研究进展

针对自清洁材料的构筑方法进行系统整理和归纳,围绕自清洁表面亲疏水性不同(分为超疏水、超亲水、超疏水/超亲水可转变)、表面构筑机制不同进行分类阐述和总结,并对自清洁材料目前面对的困境提出发展设想。

油气与新能源融合发展路径思考与建议

“双碳”背景下油气田企业加快油气业务与新能源业务融合发展。实施路径上需推动“油、气、热、电、氢”综合能源开发利用和能源供应结构转型升级,利用低成本绿电支撑油气供给增长,大力发展地热清洁供暖以减轻冬季天然气保供压力,规模化开发光伏与风电,在风光资源丰富地区探索发展绿氢产业。同时,加大生产用能清洁替代,推动油气能源清洁低碳开发,具体包括:油气生产系统优化瘦身,推动节能提效;实施清洁电力替代,以绿电替代网电并不断提高绿电占比;实施清洁热力替代,构建低碳化、电气化工艺流程,探索利用光热、余热和低温空气热,实现对自用天然气的替代;实施生产系统再造,打造与清洁能源特性相耦合的低碳化油气生产系统。为保障油气与新能源深度融合发展,提出了四方面建议:一是推进油气产能与清洁能源同步规划、同步建设,实现“建设融合”;二是加强节能提效和新能源消纳,实现“生产融合”;三是通过一体化建设、运行和评价,实现“管理融合”;四是深化能源生产技术创新,实现“技术融合”。

SMC710煤泥重介旋流器在月亮田选煤厂的应用

月亮田选煤厂为适应矿井产能提升,针对主洗车间进行提产扩能技术改造,主洗系统采用3CDC型无压三产品重介旋流器进行分选,粗煤泥环节通过反分流设计,采用SMC710煤泥重介旋流器对精煤合介进行分选。改造后,满足了现场产能提升的需求,各项指标稳定。

装配式方舱医院适应性转型思考--以西安市草堂健康营地(方舱医院)项目为例

新冠疫情如潮水逐渐褪去,各地遗留的方舱医院既是时代的象征,也是无数社会资源的凝聚。随意拆除既有方舱医院并不符合可持续发展理念,同时拆除过程中耗费的人力物力以及产生的隐患也使得这一举动并不明智。如何高效绿色安全地使方舱医院继续产生社会与经济双重效益成为文章需要讨论的重点。文章在梳理新冠疫情时期我国装配式方舱建设概况的基础上,总结历史经验与现实教训。提出当下方舱医院的转型应基于“直接效益与突发事件应急体系相结合”,向着“尽洁尽效,平疫转换”转变的思考建议。