摘要：论述了多端混合直流输电的技术特色,并设计了一种多端混合直流输电系统。多端混合直流输电系统容量大、运行方式复杂、可靠性要求极高。以三端混合直流输电为背景,研究了特高压多端直流输电控制保护技术,描述了多端直流输电系统的适用场景,以及技术特点以及相关实现的方式。

摘要：随着现代服务业的快速发展,高职院校涉商专业在培养复合型技术技能人才方面发挥着日益重要的作用。然而,在规模扩张的背后,涉商专业在人才培养模式单一、教学内容滞后、师资力量薄弱等方面仍面临诸多挑战。本研究立足“个体化学习”理念,通过文献分析、问卷调查、访谈等方法,系统剖析了制约高水平涉商专业群发展的体制机制障碍,探究了突破发展瓶颈、激发内生动力的有效路径。研究提出了“目标引领、体系支撑、动力保障”的涉商专业群可持续发展机制,从人才培养模式创新、课程教学改革、师资队伍建设、实践条件优化、质量评价完善等方面系统设计,助力涉商专业群在个性化发展道路上行稳致远。研究结论对推动高职涉商专业教育变革、破解复合型人才培养难题具有重要理论价值,对各地推进高水平专业群建设、加快构建现代职业教育体系具有现实指导意义。With the rapid development of modern service industries, business-related majors in higher vocational colleges play an increasingly important role in cultivating compound technical and skilled talents. However, behind the expansion in scale, business-related majors still face many challenges in terms of singular talent cultivation models, outdated teaching content, and weak faculty resources. Based on the concept of “individualized learning,” this study systematically analyzes the institutional and mechanical obstacles constraining the development of high-level business-related professional clusters through literature analysis, questionnaire surveys, and interviews, and explores effective paths to break through development bottlenecks and stimulate internal driving forces. The study proposes a sustainable development mechanism for business-related professional clusters characterized by “goal-oriented, system-supported, and motivation-guaranteed,” systematically designing from aspects such as innovative talent cultivation models, curriculum and teaching reforms, faculty team building, optimization of practical conditions, and improvement of quality evaluation, to help business-related professional clusters achieve stable and far-reaching development on the path of personalized growth. The research conclusions have important theoretical value for promoting the reform of higher vocational business-related professional education and solving the difficulties in compound talent cultivation. They also have practical guiding significance for various regions to advance the construction of high-level professional clusters and accele

摘要：在乡村振兴战略背景下,电商直播已成为连接农村产品与市场的重要桥梁,对推动农村经济发展具有重要作用。然而,湘西地区在电商直播人才培养方面仍面临诸多挑战。本研究基于湘西地区实际情况,探讨构建适合当地特色的电商直播人才协同培养模式,以促进乡村振兴。文章通过文献综述、实地调研、问卷调查、访谈、案例分析,深入分析了湘西农村电商直播人才的现状与需求,构建了理论框架,设计了具体的协同培养模式及实施方案。研究发现,电商直播在提升农产品销售、构建品牌形象、增加农民收入等方面发挥了重要作用。针对湘西地区人才培养面临的资源不足、校企合作不畅等问题,本研究提出了一种多元参与、资源共享的协同培养模式,强调教育机构、企业、政府和社区的紧密合作。该模式通过优化课程体系、创新教学方法、加强实践教学等方式,旨在培养既具备专业技能又深植地方文化的电商直播人才。研究结果为湘西及类似地区的乡村振兴提供了新的思路和实践指导。In the context of rural revitalization strategy, e-commerce live streaming has become an important bridge connecting rural products with markets, playing a crucial role in promoting rural economic development. However, the Xiangxi region still faces numerous challenges in cultivating e-commerce live streaming talents. Based on the actual situation in Xiangxi, this study explores the construction of a collaborative training model for e-commerce live streaming talents tailored to local characteristics to promote rural revitalization. This study thoroughly analyzes the current status and needs of rural e-commerce live streaming talents in Xiangxi, constructs a theoretical framework, and designs a specific collaborative training model and implementation plan through literature review, field research, questionnaire surveys, interviews, case analysis. The research finds that e-commerce live streaming plays a significant role in enhancing agricultural product sales, building brand image, and increasing farmers’ income. Addressing issues such as insufficient resources and ineffective school-enterprise cooperation in talent cultivation in the Xiangxi region, this study proposes a collaborative training model featuring multi-party participation and resource sharing, emphasizing close cooperation among educational institutions, enterprises, government, and communities. This model aims to cultivate e-commerce live streaming talents with both professional skills and deep roots in local culture through optimizing curriculum systems, innovating teaching methods, and strengthening practical t

摘要：针对电传动驱动履带车辆,提出了一种适应于转向阻力变化的转向控制策略.通过对转向动力学模型进行等效线性转换,推导了应用模型参考自适应控制基本原理的系统控制结构,设计了能够有效调节电机驱动扭矩的自适应控制策略.建立了基于转向自适应控制策略的履带车辆仿真模型,进行了6种给定转向工况的仿真.结果说明,在应用自适应控制后,当地面转向阻力变化时,履带车辆能够获得期望的转向角速度响应.自适应控制策略保持车辆转向稳定性的控制能力良好,且简化了驾驶员操纵,降低了电机控制难度.

摘要：针对天然气管道高后果区变化人工调查效率低的问题,提出基于多尺度融合的高后果区变化检测算法。首先对天然气管道沿线高后果区两期影像进行矢量裁剪,然后将两期高后果区影像输入变化检测算法中,计算出整幅影像的建筑变化特征信息,最后根据整幅影像计算结果生成变化图斑矢量。网络中设计的多尺度融合模块融合了高层特征信息和底层特征信息,此外增加的注意力机制模块从通道和空间范围提取具有区分性的特征信息。以武汉地区忠武线天然气管道线路为研究对象,使用2019年和2020年遥感影像开展实验,F1值和召回率分别达到0.849、0.838。结果表明,采用基于多尺度融合的高后果区变化检测算法计算结果能够满足高后果区变化检测的实际应用需求。

摘要：预应力张拉是预应力桥梁施工的核心环节,对张拉过程和终点的自动、精确控制具有重要意义。设计了一种预应力张拉自动控制系统,在自动校正检测张拉力和张拉伸长量的基础上,建立施工中张拉力和伸长量关系,同时根据施工规范,实现有效预应力点的判定,进而确定张拉终点。实验和现场施工应用表明,在张拉伸长量误差<0.1 mm,张拉力误差<0.02 MPa的前提下,该系统对张拉有效应力点的判定准确率为98%,满足自动施工要求。

摘要：目前多端柔性直流输电系统需要在各个换流站内设置运行人员监控系统,每个站都要独立设置运行人员,并24小时监控,效率很低,并且可靠性差。针对多端柔性输电系统的特点,提出了一种实时性强的多端输电监控系统,促使传统意义上的监控系统从各自独立过渡到网络化、一体化、智能化的监控系统。通过在南网多端柔直动模仿真工程上的实施,证明此方案是高效的,大大节约了换流站监控人员的维护成本,并提高了效率和智能化水平。

摘要：又是一部抗日题材的主旋律战争片,值得肯定的是,本片中的日寇并非是以往某些主旋律影片中的矮冬瓜、罗圈腿和零智商,而是训练有素的精英部队,真实地再现了历史。但导演在战争戏的设计上却没能摆脱传统主旋律的窠臼,深受"我军永远比敌军能打,敌人永远比我军愚蠢"的桎梏。无论是阵地争夺还是城市巷战,国军打死的日军都远超过自身的伤亡,尤其是影片将战争转折点设计为日军使用毒气弹来攻破常德,仿佛敌军不用此招,别无他法。

摘要：以云南昆明明清时期寺庙园林要素初步研究为基础,实地调查昆明著名寺庙园林昙华寺、黑龙潭放生池、顺城清真寺、海源寺、金殿等的山水构架、理水及建筑特点、植物配置等情况,对影响明清时期园林发展的诸多因素进行分析研究,简述昆明市明清时期的寺庙园林艺术特征,回顾明清时期寺庙园林要素的特点,并对昆明市寺庙园林的保护和开发提出一定参考性和建设性的建议。

摘要：建筑工程的经济效益需要依托科学的管理活动才能得以彰显,现代建筑经济管理更加注重管理理念的先进性,而全过程工程造价管理作为一种精细化程度以及覆盖范围更广的管理活动,在建筑经济管理中得到广泛应用。本文正是基于全过程管理这一理念,对建筑工程造价的管控要点进行探讨。