摘要：在数智技术引发的颠覆性环境变革下,面临经营难题的院线与影院亟须重塑传统的运营模式与价值网络,以服务逻辑替代商品逻辑,以协同共创超越分立竞争。服务生态系统理论视角恰好适应了我国传统放映端的转型需要,通过从场景体验、价值共创、数智融合与制度调控四个层面探索我国电影放映服务生态的构建机理与实践路径,能够为后疫情时期扩大电影受众规模,促进放映端及整个电影产业机制的可持续创新发展提供有益指导。

摘要：Introduction As a kind of high-energy electromagnetic radiation,gamma rays can lead to radiation effect and environmental *** ensure the reliability and safety utilization of gamma radiations in different areas,materials with reliable gamma shielding performances should be *** existing efforts are to use glasses as alternative for the conventional radiation shielding *** a typical window material,glass itself has attracted wide attention due to its unique chemical and physical *** them,lead-based radiation shielding materials are widely used in the field of ionizing radiation protection due to their reliable physical *** the nuclear industry and high energy physics laboratories,different materials can be used for temporary or permanent *** lead-based glass doped with heavy metal oxide PbO is widely used in the field of radiation shielding for a long time with reliable light transmission properties,which facilitates the observation and monitoring of radiation *** this paper,three kinds of transparent silicate glass with different PbO contents were prepared by a high-temperature melting forming *** gamma-rays protection abilities of the three kinds of glass were investigated through experimental and thermotical *** chemical and thermal stability of the glass were also *** addition,the influence mechanism of the structure and performance differences of the three kinds of glass was also *** Analytical pure quartz sand(SiO_(2),purity 99.5%,in mass,the same below),lead monoxide(PbO,purity 99.0%),potassium nitrate(KNO3,purity 99.0%)and sodium nitrate(NaNO3,purity 99.0%)were selected as raw materials for preparation of three kinds of gamma-rays shielding glass materials by a high-temperature melting *** appropriate amount of raw materials was thoroughly mixed and added to 3 L quartz crucible and heated in air at 1200℃.Then the raw materials were melted at 1250℃for 14

摘要：以英国斯特拉福德市建设全域文旅IP的成功实践为例,客观分析常州文化旅游IP有待提升的空间和原因,深度探讨常州地方文化基因和特有资源,提出以追怀季子先贤遗风和诚实守信重节重义价值观为主题,以浸润着江南水文化的常州发展历程为脉络,设计创排《光耀中华》大型演出,用旅游演艺彰显常州特色,增强城市吸引力,树立常州文旅IP新形象。

摘要：传统的大型风力发电机组控制技术对于快速变化的风速调节相对滞后,对于具有强非线性、随机不确定性且工作范围较宽的风电系统而言适用性较差。为此,引入自适应分段控制技术,设计了大型风电机组的智能化柔性变桨算法和柔性偏航算法,实现了大型风电机组有功无功的分段线性控制。基于现代控制方法,提出了一种自抗扰-神经网络控制技术,使风力发电机组对参数摄动和负荷扰动具有强鲁棒性,实现在各种风速下均能够灵活地控制风力发电机组的输出功率,拓宽其应用范围。通过对自抗扰-神经网络控制进行仿真分析,验证了所提控制策略的可行性和有效性。

摘要：采用动态力学分析的频域方法研究了聚合物改性水泥浆体的黏弹性,通过对柔量的复平面分析,采用二级标准固体流变模型来描述聚合物改性水泥浆体的黏弹性行为,并求得了模型参数.对3种配比的乙烯/醋酸乙烯共聚物(EVA)乳胶粉改性水泥浆体试样在0.01~100.00 Hz频率下的试验结果进行拟合,结果表明:二级标准固体流变模型简单实用,能较好地解释聚合物改性混凝土的黏弹性行为,进一步验证了频域方法的实用性,以及二级标准固体流变模型的适用性;所得结果对聚合物改性混凝土黏弹性的研究有一定的参考意义,在实际应用中可以为满足干缩和徐变要求的混凝土配合比设计提供参考.

摘要：设计了一种基于平均一致算法的光伏电站参与电网调频控制策略。该策略可以在多个光伏电站仅进行邻域通信的情况下实现多电站协同调频,调频效果较非协同控制策略更优。由电网频率通过下垂控制得到多电站总参考有功功率后,多个光伏电站可以借助邻域通信计算得到各自的最优参考功率。各电站通过本地的模型预测控制方法控制逆变器达到跟踪给定参考功率的目的。该策略可以应用于多种地理条件下的多个光伏电站协同参与电网调频。仿真结果表明,该策略能够使电网频率较电站恒功率输出时波动较小,逆变器控制具有良好性能。

摘要：针对激光雷达距离选通可实现不同距离雷达回波信号的选通采集,采用AD9501延时芯片和单片机设计了脉冲延时时间和脉宽可调的延时电路。其中,采用LabVIEW编写上位机控制软件,2片延时芯片级联实现了16位精度的延时调节,第3片延时芯片及R-S触发器实现了8位精度的脉宽的调节。实验中,3片AD9501由单片机进行控制,通过调整电路参数和上位机参数,延时范围达到1.8μs可调,延时精度大约为30ps,存在固有延时280ns,完全满足激光雷达距离选通的要求。