东海大桥工程设计简介

东海大桥起始于上海浦东南汇区的芦潮港,跨越杭州湾北部海域,直达浙江省嵊泗县崎岖列岛的小洋山岛(见图1)。它是上海国际航运中心的集装箱深水港必不可少的配套工程,直接为港区大量集装箱陆路集疏运需求和港区供水、供电、通讯等工程服务。1 工程规模东海大桥初步设计工程范围:芦潮港新老大堤之间2264m 的陆上段,芦潮港至嵊泗崎岖列岛的小乌龟岛之间24504.5m 的海上段,小乌龟岛至小洋山     

单元式采暖中燃气管道的计算

根据单元式采暖的特点，以房间热负荷为基础，计算燃气管道的计算流量。     

城市汽车加气站的技术与经济分析

通过对压缩天然气和液化石油气汽车加气站的技术、环保、投资分析，提出了一些加气站的新技术和汽车改装技术及环保、投资效益，以引起社会和政府有关部门的重视。     

第三代移动通信系统的佼佼者—宽带CDMA

本文通过分析移动通信与个人通信的发展趋势,认为基于ＩＳ－９５标准的Ｗ－ＣＤＭＡ系统是第三供移动通信系统中前景看好的代表系统。文章阐述了Ｗ－ＣＤＭＡ的优势,有待解决的问题以及支持Ｗ－ＣＤＭＡ的新技术,本文工作得到了“８６３”高科技计划个人通信项目组的支持。     

A 75 nm 7 Gb/s/pin 1 Gb GDDR5 Graphics Memory Device With Bandwidth Improvement Techniques

Modern graphics subsystems (gaming PCs, midhigh end graphics cards, game consoles) have reached the 2.6-2.8 Gb/s/pin regime with GDDR3/GDDR4, and experimental work has shown per pin rates up to 6 Gb/s/pin on individual test setups. In order to satisfy the continuous demand for even higher data bandwidths and increased memory densities, more advanced design techniques are required. This paper describes a 7 Gb/s/pin 1 Gb GDDR5 DRAM and the circuit design and optimization features employed to achieve these speeds. These features include: an array architecture for fast column access, a command-FIFO designed to take advantage of special training/tracking requirements of the GDDR5 interface, a boosting transmitter to increase read eye height, sampling receivers with pre-amplification and offset control, multiple regulated internal voltage (VINT = 1.3 V) domains to control on chip power noise, and a high-speed internal VINT power generator system. The memory device was fabricated in a conventional 75 nm DRAM process and characterized for a 7 Gb/s/pin data transfer rate at 1.5 V Vext.     

钛制压力容器设计中有关问题的考虑

本文结合GB151-1999《管壳式换热器》新增有色金属产品的情况，以钛制压力容器及换热器设计中碰到的问题为线索，讨论了钛制压力容器设计中需要注意的问题。     

麦德林克里克拉酒店

该酒店位于麦德林市埃尔珀布拉多的一个规整的街区内.新落成的建筑调整了原有街区结构,创造出一个便于人们通行的半公共空间,将步行通道、楼梯、庭院、裙楼、平台、露台和带顶广场融合在同一处场地内.建筑本身作为城市的十字路口,呈可穿透式布局,拥有多条出入口,并被本地植物环绕.建筑旨在将城市的日常生活与酒店及其客人的活动融合起来.其设计理念是打造多样化的文化活动中心,通过艺术、美食节、博览会、音乐会、戏剧、夜生活等各式各样的娱乐形式来激活当地的创意产业,让酒店生活与城市日常相互融合、相互补充.     

2618A合金作动筒铰链接头超塑等温精锻技术

本文根据作动筒铰链接头的几何结构特点、技术要求,确定了超塑性等温精锻工艺为最佳成型工艺方案。文中概要介绍了在5×10~4kN液压机上实现新工艺时的金属流动和模具结构特性。经试验确定了较佳变形温度约为450℃,应变速率为5.9×10~(-4)s~(-1)～1.7×10~(-2)s~(-1),较佳毛坯外形尺寸和润滑剂。最后分析了精锻件上产生缺陷的原因和消除缺陷的方法。用新工艺生产的精锻件质量有很大提高,并具有明显的经济效益。     

新型HR500-N离心机在我厂真空制盐中的运用

通过对原HR500-N离心机液压系统的改进，使活塞推料力和推料次数增加，促使整机性能提高。文章介绍了改进后的离心机工作特点和经济效益分析。     

Mathematical approach to assessing spelt cultivars (Triticum aestivum subsp. spelt) for pasta making

This study investigates dough rheology of three wholemeal spelt flours cultivars and influence of egg quantity (0–248 g kg^?1) on the technological and sensory quality of wholemeal pasta. Standard scores (SS), based on assigning equal weight to applied parameters (rheological, chemical, technological and colour), has been calculated and the obtained values compared. Correlation coefficients of SS with alveograph data for P, L, G and W are 0.99, 0.98, 0.99 and 0.91, respectively, and warm pasta stability and retrogradation of starch correlated to SS at level 0.99. For PCA modelling, two 9 × 15 data matrices were divided into different rheological or integrated chemical, technological quality and colour evaluation methods data sets. Standard scores analysis points out that owing to its good rheology, pasta made by cultivar Austria has the best technological quality in relation to the technological quality of the other two cultivars (Nirvana and Eko).