摘要：一则好的影视广告是由许多重要的元素构成的,包括视觉要素、听觉要素、语言要素等,不同的组成部分会对视频广告本身产生不同的影响。本文主要侧重于听觉要素中的音乐元素来做调查探究,在此基础上,更进一步地分析视频广告中的音乐对视频类广告效果的影响,并提出相应的建议,希望能对视频类的广告制作提供参考。

摘要：本文介绍了喷砂泵的主要用途,特点和液压系统工作原理,采用了液压缸和液力缸双串联的设计方法,建立了液压缸与液力缸的数学模型,并进行了动态特性分析。

摘要：复合式液压缸是一个单杆活塞缸和一个普通柱塞缸的复合体。其中单杆活塞缸的缸体兼有两个“身份”,它既是活塞缸的缸体,又是柱塞缸的柱塞。这种复合液压缸的用途已不仅仅局限于作为普通的液压执行元件,而具有更广泛的用途。

摘要：岩滩水库调度自动化根据“安全可靠、性能稳定、技术先进、功能齐全、经济合理、维护方便”的原则,采用目前流行软件、硬件工具。

摘要：介绍了隔离式浆体泵驱动液控制阀在长期的现场运行中存在的问题。对现有阀门的问题进行剖析 ,同时提出设计改进并付诸实施。

摘要：本文介绍一种用于液压泵向三个液压缸供油 ,使三个液压缸以互成 1 2 0度角的关系进行同步运动的液压回路。

摘要：介绍一种用于输送含有固体颗粒的两相流体的浆体泵,论述它的工作原理、结构和性能特点。该泵在隔离方式、流量平稳性和可靠性方面有新的突破。

摘要：实时闸门监控系统本着“安全、稳定、可靠、先进、实用”的原则设计,实现“有人值班,少人值守”。

摘要：Bogies are responsible for a significant amount of aerodynamic resistance and noise,both of which negatively affect high-speed train performance and passenger *** the present study,the passive control method is applied in designing the bogie cabins of a high-speed train to improve its aerodynamic *** passive control measures are introduced,namely,adding a spoiler and creating diversion grooves near the bogie ***,the aerodynamic and aeroacoustic characteristics of a high-speed train operating at 350 km/h under different control strategies are numerically investigated using the improved-delayed-detached-eddy simulation(IDDES)and the acoustic finite element method(FEM).The impacts of passive control devices on drag reduction,slipstream,and aerodynamic noise are presented and *** results reveal that the passive control devices have a major effect on the slipstream around the *** amplitude of the fluctuating pressure is higher in the first half of the train than in the second *** first bogie has the maximum amplitude of the acoustic pressure for both the train with and without passive *** the far field,the spoiler installation and placement of the diversion grooves in the front of the bogie cabin can significantly reduce aerodynamic drag and ***,as shown in this study,using passive control methods to improve the aerodynamic and aeroacoustic properties of high-speed trains can be a viable option.

摘要：水利核心元数据标准的颁布实施已日益在水利信息化领域得到广泛使用,鉴于元数据编制手工操作的高难度及复杂性,迫切需要设计一套软件工具以方便元数据的编制和管理,提高元数据编制的质量和效率,尝试采用软件工具推进水利核心元数据标准的宣贯。本文采用Flex技术实现水利核心元数据管理系统,以满足元数据制作管理的需求,推进水利核心元数据标准的贯彻实施。