洋县森林病虫害防治工作思考与建议

介绍了洋县森防工作基本情况，阐述了森林病虫害的发生特点，防治工作存在困难和问题，提出了森林病虫害防治的建议和对策。     

Dynamical investigation and parameter stability region analysis of a flywheel energy storage system in charging mode

In this paper, the dynamic behavior analysis of the electromechanical coupling characteristics of a flywheel energy storage system （FESS） with a permanent magnet （PM） brushless direct-current （DC） motor （BLDCM） is studied. The Hopf bifurcation theory and nonlinear methods are used to investigate the generation process and mechanism of the coupled dynamic behavior for the average current controlled FESS in the charging mode. First, the universal nonlinear dynamic model of the FESS based on the BLDCM is derived. Then, for a 0.01 kWh/1.6 kW FESS platform in the Key Laboratory of the Smart Grid at Tianjin University, the phase trajectory of the FESS from a stable state towards chaos is presented using numerical and stroboscopic methods, and all dynamic behaviors of the system in this process are captured. The characteristics of the low-frequency oscillation and the mechanism of the Hopf bifurcation are investigated based on the Routh stability criterion and nonlinear dynamic theory. It is shown that the Hopf bifurcation is directly due to the loss of control over the inductor current, which is caused by the system control parameters exceeding certain ranges. This coupling nonlinear process of the FESS affects the stability of the motor running and the efficiency of energy transfer. In this paper, we investigate into the effects of control parameter change on the stability and the stability regions of these parameters based on the averaged-model approach. Furthermore, the effect of the quantization error in the digital control system is considered to modify the stability regions of the control parameters. Finally, these theoretical results are verified through platform experiments.     

基于零维杂化锑基氯化物的可逆荧光发射转化（英文）

零维有机-无机杂化金属卤化物因可调控的自陷态激子发射在发光和显示等领域具有很好的应用前景。特别是同时具有单线态和三线态激子发射双带光谱的零维金属卤化物在白光固态照明应用中极具潜力。本工作报道了两种零维杂化锑基氯化物(C₂₄H₂₀P)₂SbCl₅(Ⅰ)和(C₂₄H₂₀P)₂SbCl₅·H₂O·0.5DMF(Ⅱ)(C₂₄H₂₀P为四苯基膦,Ph₄P)。在低能量光子(如360 nm)激发下,化合物Ⅰ和Ⅱ分别呈现出由自陷态激子发射的红色和黄色的单峰宽带光谱。此外,当用高能量光子(如310 nm)激发时,Ⅱ的光谱呈现出双带白光发射,除黄光发射带外,还出现了一个源于单线态自陷激发发射的蓝光发射带。研究表明,通过引入和去除DMF和水分子,化合物Ⅰ和Ⅱ能实现可逆转化。该研究揭示了小分子对零维杂化金属卤化物晶体结构的调控机制,从而实现单带发射和...     

推进企业文化建设应注重“五个结合”

企业文化是一个企业在长期生产经营过程中,把企业内部全体员工结合在一起的理想信念、价值观念、管理制度、行为准则和道德规范的总和。企业文化的建立是与企业发展的不同时期和企业自身的特点相适应的,且与企业的发展目标和企业发展战略一致,也是与企业自身条件相吻合的,是理性化的,绝不能掺杂着个人的感情成分,一个公司的企业形象,可以洞察文化的系统概貌和整体水平,也可以评估它在企业竞争中的真正实力。先进的企业文化,是企业在长期生产经营、改革发展中沉淀、提炼形成的,是企业生存和发展的内在动力,是规范企业和员工行为的软约束,是提升企业形象、增加企业价值的无形资产,是企业核心竞争力的形成要素和重要组成部分。     

洋县林权流转情况现状与思考

林改后林权流转成为当前新形式下农民增收、社会力量投资林业、盘活林地资源的一个重要途径。本文通过对洋县林权流转情况的调研，剖析了目前林权流转的现状和存在的问题，对完善林权流转政策和提供林权交易服务平台提出一些建议。