Energy consumption and economic growth in the light of meeting the targets of energy policy in the EU: The bootstrap panel Granger causality approach

The aim of the paper is to assess linkages between energy consumption and economic growth in the light of compliance with the EU energy policy targets stated in the climate and energy package for 2020 in the European Union member states in the period 1993–2011. The study is divided into two main stages. During the first one, using cluster analysis methods, four groups of countries which met three energy policy targets stated in the package at similar levels were identified. During the second stage, the bootstrap Granger panel causality approach proposed by Kònya (2006) was used to verify the hypothesis of causality between energy consumption and economic growth in the countries from four groups created in the previous step. The global financial crisis was also taken into account. The results obtained reveal that the level of compliance with energy policy targets influences linkages between energy consumption and economic growth. The results indicate causal relations in the group of countries with the greatest reduction of greenhouse gas emissions, the highest reduction of energy intensity and the highest share of renewable energy consumption in total energy consumption. In the remaining groups the results mostly confirm the neutrality hypothesis.     

新冠肺炎疫情对2020年电力消费影响及趋势研究

电力消费是电网公司制定中长期电力规划、当年综合计划的重要边界条件,精准衡量2020年新冠肺炎疫情影响意义重大。构建疫情对电力消费的影响测算和预测模型,设计基准、风险情景,从总量、产业、行业、区域、省份等维度测算疫情及政策因素对电力消费影响程度,预测2020年电力消费增长趋势。结果表明：预计疫情及政策因素拉低2020年国家电网经营区用电量增速2.6~3.3个百分点。新冠肺炎疫情对电力消费产生了明显冲击,后期应紧密跟踪疫情影响、滚动调整预测结果。     

基于dsPIC30F2020的移相控制全桥变换器

介绍了dsPIC30F2020芯片及其在DC／DC变换器控制中的应用,并用该芯片作为主控制芯片设计了一个平均电流模式控制的移相控制全桥DC／DC变换器,最后比较了数字式控制DC／DC变换器与模拟电路控制的DC／DC变换器的优缺点。     

基于多级特征融合的体素三维目标检测网络

目的 为精确分析点云场景中待测目标的位置和类别信息,提出一种基于多级特征融合的体素三维目标检测网络。方法 以2阶段检测算法Voxel?RCNN作为基线模型,在检测一阶段,增加稀疏特征残差密集融合模块,由浅入深地对逐级特征进行传播和复用,实现三维特征充分的交互融合。在二维主干模块中增加残差轻量化高效通道注意力机制,显式增强通道特征。提出多级特征及多尺度核自适应融合模块,自适应地提取各级特征的关系权重,以加权方式实现特征的强融合。在检测二阶段,设计三重特征融合策略,基于曼哈顿距离搜索算法聚合邻域特征,并嵌入深度融合模块和CTFFM融合模块提升格点特征质量。结果 实验于自动驾驶数据集KITTI中进行模拟测试,相较于基线网络,在3种难度等级下,一阶段检测模型的行人3D平均精度提升了3.97%,二阶段检测模型的骑行者3D平均精度提升了3.37%。结论 结果证明文中方法能够显著提升目标检测性能,且各模块具有较好的移植性,可灵活嵌入到体素类三维检测模型中,带来相应的效果提升。     

Seventeen‐inch laser backlight in‐plane switching liquid crystal display with 8K, 120‐Hz driving,and BT.2020 color gamut

We have developed a 17‐inch laser backlight in‐plane switching liquid crystal display satisfying the main BT.2020 specifications, which are 8K, 120‐Hz driving, and a BT.2020 wide color gamut. The color gamut of the developed in‐plane switching liquid crystal display covers 98% of the BT.2020 wide color gamut, thanks to a laser backlight and appropriate color filters. The liquid crystal response time of 5 ms, which is sufficient for 120‐Hz driving, is achieved by adapting a faster in‐plane switching liquid crystal display, namely, the short‐range lurch control in‐plane switching liquid crystal display.     

巢湖流域2020 年特大洪涝灾害应对实践与思考

2020年梅雨期间巢湖流域遭遇多场暴雨,发生特大洪涝灾害,巢湖忠庙站最高水位超100年一遇,洪水位创历史新高达13.43 m。通过对2020年巢湖流域雨情、水情等分析及与近期大水年份的对比,总结了流域安全度汛的实践经验,分析了流域防洪存在的主要问题,提出了下一步防洪除涝治理建议。     

2020年汛期我国主要天气气候特征及成因分析

利用国家气候中心实时和历史气象观测数据,对我国2020年汛期(3月28日至9月8日)气候特点进行了综合分析。分析结果显示,2020年汛期,我国气候特征总体雨多温高、涝重于旱,且气候异常突出、极端事件频发。一是我国多地出现阶段性的暴雨洪涝,覆盖范围广、极端性强、累计降雨量大;二是南方出现了1961年以来持续时间第2长的区域性高温天气过程;三是台风总体不活跃,但阶段性突出,出现了1949年以来首个7月无编号无登陆台风的情况;四是气象干旱总体偏轻。分析还显示,2019年秋季至2020年春季,赤道中东太平洋出现的弱厄尔尼诺事件,以及北印度洋海温的持续偏高导致西太平洋副热带高压持续偏强,是造成我国汛期气候异常的重要原因。     

肥料展望2016-2020年(摘要报告)

分析当前世界经济和政策背景,预测2016--2020年世界农业和肥料需求、肥料供应,包括:2016/2017年全球谷物库存充沛,中期内农业生产缓慢增长;2016/2017年世界肥料需求回升,2020/2021年世界肥料需求略低于2.0亿t;肥料产能明显扩大.展望2016-2020年氮素、磷酸盐、钾盐、硫素的产能、供应和需求形势.     

Heuristic approach to selecting a color appearance model for hue‐preserved wide‐color gamut mapping

With the advent of wide‐gamut system colorimetry for ultra‐high definition television, the development of a gamut mapping algorithm for wide to standard gamuts is greatly needed. Most gamut mapping techniques have been developed to retain the perceived hues of the source as predicted by a color appearance model. However, some color appearance models erroneously predict the saturated colors, generating a serious hue discontinuity in wide‐color gamut mapping onto the Rec. 709 gamut boundary. This paper presents a heuristic approach to determining whether a color appearance model may create such artifacts when used in hue‐preserved gamut mapping algorithms.     

High efficiency and ultra‐wide color gamut quantum dot LEDs for next generation displays

Colloidal quantum dot‐based hybrid light‐emitting diodes (QLEDs) have been demonstrated that exhibit quantum efficiencies (EQEs) >10% for all three fundamental colors red, green, and blue (21% EQE, 82 cd/A for green). This is the first report of a green QLED with EQE >20% and current efficiency >80 cd/A. The devices have the longest lifetimes reported in the literature (280k hrs) and extremely well‐tuned color fidelity. The narrow QLED emission spectra (full width at half maximum < 30 nm) and well‐controlled peak wavelengths generate a color gamut covering >170% of the National Television System Committee (NTSC) 1987 color space and ~90% of the Rec. 2020 color space. This color gamut is larger than that of OLED televisions in mass production and is the largest of all QLEDs reported. Additionally, these devices are completely fabricated using solution‐processing techniques. The extremely desirable properties of high efficiency, color tunability/fidelity, long lifetime, and low cost processing from solutions make QLED technology disruptive and will lead to next generation displays.