大型箱载式雪上赛事转播系统建设与应用

福建省广播影视集团整合设备资源,采用部分4K超高清设备的方案,为第十四届全国冬季运动会(以下简称十四冬)雪上赛事转播建设一套大型箱载式电子现场制作(Electronic Field Production,EFP)系统。从建设背景、系统设计和集成等方面介绍系统的建设过程,介绍该系统在十四冬的应用情况,重点阐述在实际应用中如何运用最精简的设备实现高质量的慢动作制作和MCF(Multi Clips Feeds)制作,分享南方技术团队第一次承接雪上赛事转播遇到超低温环境下户外设备出现的问题和采取的解决办法。

Closed-form solution for shear lag effects of steel-concrete composite box beams considering shear deformation and slip

Based on the consideration of longitudinal warp caused by shear lag effects on concrete slabs and bottom plates of steel beams,shear deformation of steel beams and interface slip between steel beams and concrete slabs,the governing differential equations and boundary conditions of the steel-concrete composite box beams under lateral loading were derived using energy-variational method.The closed-form solutions for stress,deflection and slip of box beams under lateral loading were obtained,and the comparison of the analytical results and the experimental results for steel-concrete composite box beams under concentrated loading or uniform loading verifies the closed-form solution.The investigation of the parameters of load effects on composite box beams shows that:1) Slip stiffness has considerable impact on mid-span deflection and end slip when it is comparatively small;the mid-span deflection and end slip decrease significantly with the increase of slip stiffness,but when the slip stiffness reaches a certain value,its impact on mid-span deflection and end slip decreases to be negligible.2) The shear deformation has certain influence on mid-span deflection,and the larger the load is,the greater the influence is.3) The impact of shear deformation on end slip can be neglected.4) The strain of bottom plate of steel beam decreases with the increase of slip stiffness,while the shear lag effect becomes more significant.

新疆电视台少数民族语言专题节目250平米演播室系统简介

系统设计原则 新疆电视台250平米演播室．位于台演播制作中心二楼。该演播室主要承担我台少数民族语言专题、小型文艺等节目的高标清录制和直播任务。此次系统改造，本着有效合理配置设备资源的原则，视、音频系统设计成箱载式4讯道高清电视演播室系统。系统同时含箱体、箱体内减震机柜、机房内部技术用配电及接地系统。平时，