摘要：[Introduction] With the development of "3060" double carbon target, the usage of the PV and wind power for hydrogen gas production is becoming a hot and cutting-edge direction. The combustion of natural gas mixed with hydrogen gas in gas turbine of hydrogen gas industry will become the final step to convert hydrogen into electric power. The gas turbine unit have pressure regulation station, front module and connection pipe. The front module have requirements on the flow rate, pressure, temperature and particle content. And the pressure regulation station will provide the required mixed gas to front module. The connection pipe will have a length of 1 000 m which depended on the different arrangement. The character of pressure drop and temperature drop of connection pipe will have direct impact on the interface parameter of pressure regulation station. So it is necessary to study the character of pressure drop and temperature drop of connection pipe. And it will provide a practicable solution for the future gas turbine fired with natural gas mixed with hydrogen gas. [Method] The fuel demand was given for the H class gas turbine fired with mixture of natural gas and hydrogen gas after the simulation calculation with GT Pro software. The recommended material selection and velocity selection were presented based on required temperature and pressure drop by H class gas turbine front module and the physical character of mixed gas. The pipe pressure drop and temperature drop due to pressure drop were also calculated. [Result] The pipe material selection, diameter selection, pipe pressure drop and temperature drop due to pressure drop of pipe are presented. [Conclusion] For present time, the pipe design between natural gas pressure regulation station and gas turbine front module shall evaluate the material, outer diameter, wall thickness, velocity, pipe resistance, etc., each by each under the condition with hydrogen gas mixture. Thus the gas turbine can use natural gas at p

摘要：[Introduction] Aiming at the characteristics of offshore converter stations, the design scheme for wireless communication system of offshore converter station is proposed. [Method] By analyzing the characteristics and current application of offshore wireless communication technology and considering the requirements of equipment operation, station warning and personnel activities of offshore converter stations, the configuration scheme for the wireless communication system of offshore converter stations was proposed. [Result] Through the NAVTEX system, the requirement to receive weather and safety information is realized. Through the radar optoelectronic system and VHF ship to ship communication system, the requirement for vessel caution and expulsion is realized. Through UHF cluster intercom system, WiFi and mobile communication system, the daily communication requirement of personnel is realized. Through the lifeboat emergency communication system, microwave transmission system and satellite communication system, the requirement of personnel emergency avoidance is realized. [Conclusion] Therefore, the system can realize the basic communication requirements during the daily operation and maintenance of offshore converter stations, ensure the safety of equipment and personnel, and provide guidance for the design of wireless communication systems for offshore converter stations. © 2024 energy china GEDI. Publishing services by energy Observer Magazine Co., Ltd. on behalf of energy china GEDI.

摘要：使用液态碳氢化合物燃料的固体氧化物燃料电池(SOFCs)的商业化极大地受到阳极易积碳的阻碍.调控碳氢燃料重整反应位点的局域蒸汽/碳比以提高抗积碳性能是有效的,但仍面临挑战.本文报道了一种新型二氧化铈基催化剂(Ce_(0.95)Ru_(0.05)O_(2-δ),CR5O)的理性设计.催化剂在实际应用过程中,表现出优异的抗积碳性能.在电池运行条件下,催化剂CR5O被还原为二氧化铈骨架及镶嵌在骨架表面的Ru纳米颗粒(Ru/Ce_(0.95)Ru_(0.05)O_(2)-δ,Ru/CR5-xO).Ru/CR5-xO表现出优异的自水合能力,可以有效去除催化剂表面产生的积碳.当应用于以液态碳氢化合物为燃料的SOFCs时,电池表现出优异的电化学性能:在750℃下,以甲醇为燃料时,电池的峰值功率密度达到1.010W cm^(-2),并且在稳定运行的200h以内,没有明显积碳现象.此外,密度泛函理论计算表明,Ru/CR5-xO催化剂修饰的Ni-YSZ阳极的高活性和抗积碳性能归因于速率限制步骤的能垒降低和用于快速除碳的COH中间体的形成.

摘要：在 Daya 海湾实验的成功以后， Jiangmen 地下的中微子天文台(Jupiter 之妻) 被发射测量中微子团层次和摆动参数并且学习另外的中微子物理。它的中央察觉者从反应堆，地球，空气，和阳光被放为反中微子。中央察觉者的主要要求是液体闪烁器的 20 kt 的抑制，作为目标团，和 3% 精力分辨率。它关于有它的内部表面上的 PMT 的 75% 范围的 38.5 m 的一个球形状察觉者。因为它必须为物理测量的几种不同类型满足要求并且在它的结构和工程拥有可行性和可靠性，如此的一个巨大的察觉者的设计是大挑战，都在合理时间和费用。为 JUNO 中央察觉者的一种选择是超丙烯酸的球在水里沉没了防护背景。这份报纸为如此的一个丙烯酸的球建议一个结构的计划那被支持由一不锈钢捆绑，在土木工程由支持点的眼镜窗帘墙启发了。计划的初步的设计被有限元素(FE ) 用 ABAQUS 完成并且验证方法。FE 分析证明计划能在 5 ～ 10 MPa 的限制以内控制丙烯酸的球的压力水平，根据中央察觉者的设计目的需求。计划具有突出的全球稳定性并且在本地连接上允许各种各样的选择。我们证明计划可行性好并且应该是为中央察觉者的一种合理选择。

摘要：In order to improve performance of the DA465Q gasoline engine, a substantial amount of research was done to optimize its turbocharging system. The research led to the GT12 turbocharger being selected and its turbocharging parameters being settled. Based on these tests, rational matching was worked out for respective components of the turbocharging system. Results show that this turbocharger allows the engine to easily meet the proposed requirements for power and economic performance, giving insight into further performance improvements for gasoline engines.

摘要：长寿命溶解氧海水电池是深远海观测能源网络的重要组成单元,但海水贫氧复杂环境对设计高性能氧还原催化剂提出了重要挑战.本文以酞菁铁为模型催化剂,通过理论计算与实验验证,提出了活性位点电子轴向拉伸可大幅提升催化剂在极端贫氧环境中的氧还原活性和稳定性.该研究为构建高性能海水电池提供了材料学解决方案,同时为极端环境下催化剂的变革性设计提供了新的思路.

摘要：目的:非矩形平面框架致使其交叉斜撑体系具有非对称性,而采用了非连续支撑的非对称非连续交叉支撑体系的面外稳定问题更为复杂。本文旨在通过建立无量纲稳定特征方程,从理论上深入阐释该交叉支撑体系的面外屈曲特征,并为工程设计提供显式的压杆计算长度系数的计算公式。创新点:1.建立一般情况下非对称非连续交叉斜撑体系的无量纲特征方程;2.针对各种可能受力工况,详细分析该交叉支撑体系的面外屈曲特征,并给出理论解释;3.提出非对称非连续交叉斜撑体系中压杆计算长度系数的显式经验计算公式。方法:1.通过对非对称非连续交叉支撑体系进行弹性面外屈曲建模,以及稳定平衡方程的无量纲化,推导出其相应的特征方程;2.通过变量替换,揭示其内在对称性,从而为经验公式的构造提供依据;3.针对各种受力工况,进行求解域分析和确定,完成特征方程的求解,以进行面外屈曲特征分析,并提出压杆计算长度系数的经验公式;4.利用经验公式对多个实例进行计算,并与基于有限元的刚度法结果以及以往的文献数据进行比较,以验证经验公式的可靠性。结论:1.推导出了非对称非连续交叉斜撑体系的特征方程;采用无量纲参数后,该方程具有一般性。2.通过变量替换,该方程可以转换为与单轴几何对称交叉斜撑相同的特征方程形式。3.当交叉斜撑中的连续杆和非连续杆同时受压时,非连续杆将率先失稳。4.针对各种受力工况,提出了交叉支撑体系的压杆计算长度系数的显式经验公式,且计算结果兼具可靠性和准确性。

摘要：船舶传动齿轮由于啮合过程中齿面摩擦大、温度高,经常发生磨损和胶合故障。本文基于线接触的三维混合润滑模型,建立了一种预测船用定时齿轮在一个啮合周期内的瞬态摩擦温度特性的数值解法,并与Blok理论进行了对比,验证了该方法的正确性。研究了表面粗糙度对润滑特性的影响,对几种典型齿轮副进行研究,结果表明,由于较严重的表面粗糙接触,齿轮副4-6的摩擦因数最大,界面温度最高,而抛光齿轮表面的摩擦因数最小,界面温度最低。此外,讨论了工况和结构对摩擦温度状态的影响,研究表明在重载、低速的工况会导致摩擦因数较大以及温度较高的问题。同时,通过对齿轮模数和压力角等结构设计参数的优化,可以显著提高齿轮的界面摩擦和温度性能。

摘要：目的:在实际工程服役过程中,纤维增强塑料(FRP)约束混凝土柱在遭遇极限荷载前往往已经经历了长时间的轴压荷载作用。因此,相比其短期力学性能,本文旨在研究FPR约束混凝土柱在长期荷载作用后的力学性能。创新点:1.考虑长期轴压荷载作用,提出一种轴压作用下圆形截面FRP约束混凝土柱的长期变形分析模型;2.提出了长期轴压作用后的FRP约束混凝土本构模型,从本构关系的角度描述两个方面的影响机理。方法:运用混凝土和FRP徐变的长期变形分析迭代计算方法(图3)。结论:1.提出的长期变形分析模型实现了对FRP约束混凝土柱任意目标时刻的应力和应变状态的高效、准确预测;2.将提出的本构模型嵌入有限元软件中,有效地实现对长期轴压作用的考虑;3.基于Open Sees有限元软件,验证了长期变形分析模型和本构模型的有效性和准确性。

摘要：大及超大断面硐室围岩稳定性控制是深部开采条件下的关键技术难题。本文根据龙固煤矿筛分产品转运硐室实际地质条件,利用FLAC3D中的Dynamic模块系统地研究了动静载荷影响下深部超大断面硐室围岩响应特性。结果表明:静载作用下围岩最大垂直应力、变形量及破裂范围均较大,其中应力集中系数为1.64,顶底板及两帮最大变形量分别为54.6 mm和53.1 mm。之后在动静载荷叠加扰动下,硐室围岩响应将发生进一步变化:(1)动载扰动频率对两帮的影响较为明显,当动载频率为160 Hz时两帮变形量较10 Hz时增大了50.1%;(2)动载强度对于围岩应力集中程度的影响最大,应力集中系数最大为2.38,塑性破坏更多的向围岩深部发展;(3)随着动载源与硐室距离的增加,硐室围岩响应在阻尼的作用下逐渐衰减并趋于静载状态。在此基础上,采用回归分析的方法获得了不同动载条件下的围岩响应经验方程,相关性系数均大于0.99。本研究成果可为相同或相似条件下深部超大断面硐室围岩稳定性控制及支护设计提供参考和借鉴。