水冷R407C制冷机组冷凝温度确定方法

对采用R407C制冷机组的冷凝温度确定进行了分析，并对采用R22和R407C为工质的制冷机组性能进行了对比．     

Vertical profiles of particulate organic matter and its relationship with chlorophyll-a in the upper layer of the NE Mediterranean Sea

Particulate organic matter (POM), nutrients, chlorophyll-a (CHL) and primary production measurements were performed in the upper layer of three different regions (cyclonic, anticyclonic and frontal+peripherial) of the NE Mediterranean Sea in 1991–1994. Depth profiles of bulk POM exhibited a subsurface maximum, coinciding with the deep chlorophyll maximum (DCM) established near the base of the euphotic zone of the Rhodes cyclone and its periphery, where the nutricline was situated just below the euphotic zone for most of the year. Moreover, the POM peaks were broader and situated at shallower depths in late winter–early spring as compared to its position in the summer–autumn period. Under prolonged winter conditions, as experienced in March 1992, the characteristic POM feature disappeared in the center of the Rhodes cyclone, where the upper layer was entirely occupied by nutrient-rich Levantine deep water. Deep convective processes in the cyclonic gyre led to the formation of vertically uniform POM profiles with low concentrations of particulate organic carbon (POC) (2.1 μM), nitrogen (0.21 μM), total particulate phosphorus (PP) (0.02 μM) and chlorophyll-a (0.5 μg/L) in the euphotic zone. Though the Levantine deep waters ascended up to the surface layer with the nitrate/phosphate molar ratios (28–29) in March 1992, the N/P molar ratio of bulk POM in the upper layer was low as 10–12, indicating luxury consumption of phosphate during algal production. Depth-integrated primary production in the euphotic zone ranged from 38.5 for oligotrophic autumn to 457 mg C m⁻² day⁻¹ for moderately mesotrophic cool winter conditions.     

一种声纳模拟器并行多处理器系统的设计与应用

介绍了用于某型声纳模拟器的并行多处理器系统，该系统以TMS320C30为基本处理单元，具有较强的并行处理能力。文中给出了系统的硬件结构设计和软件开发方法，并给出了与其他多DSP系统的比较结果，证明了系统具有性价高，开发周期短等优点。     

我国企业电子商务经营策略探讨

结合国外电子商务的发展情况,以及我国企业和居民消费的特点,说明面对电子商务的发展浪潮更应该保持清醒的头脑,不同的企业应采取不同的、合适的、合理的方式融入到电子商务的大潮中.在电子商务环境尚不健全的情况下,企业不应该盲目发展B2C网上零售,而是应将互联网作为大力发展资产、产权、知识专利营销的资讯平台.     

SS_(7C)客运电力机车性能综述

介绍了 Ｓ Ｓ７ Ｃ型客运电力机车的主要设计思路、特性、技术参数等，对其牵引客运列车的性能进行了简要的分析。     

机电光一体化显微手术仪研制中的并行设计方法

阐述并行设计技术的基本概念,针对机电光一体化显微手术仪的传统开发方法存在的问题,介绍采纳并行设计方法的具体实施过程,分析总结并行设计技术的应用效果.     

高校机房排课系统的设计与实现

介绍了高校机房排课系统的设计思想和实现方法,重点阐述了系统体系结构的选择、排课算法的实现,并对系统设计中的难点问题给出了具体的解决方案。     

基于单片机的车辆行驶显示装置

随着社会的发展,汽车保有量迅速增加,技术也在不断提高,道路尤其是高速公路所提供的行驶路面和周围设施布置,使得车辆越来越向高速化发展,从而交通安全成为热点问题。本文论述了一种基于单片机的车辆行驶显示装置,它有雷达、车速传感器、蜂鸣器、数码管和Atme189C52单片机组成。此装置为人们出行增添了一份保障。     

C程序代码优化的探讨

不同的层面的程序代码,可以有不同的模块组合方式,把各个模块平均运行次数与模块平均运行时间的卷积做得尽量小是优化的目标,这在数学上是一项复杂的工作。本文通过减少上下文依赖关系,分析静态变量、数据的组织和消除除法等方面探讨了代码的优化。     

用Origin C编程自动化处理制动试验数据

在对大量具有相同数据格式的制动运行试验数据文件进行处理时,通过使用OriginLab的数据处理软件Origin中特有的Origin C语言进行编程开发,可以借助其面向对象的特性及与ANSI C的兼容性,方便快捷地开发出满足要求的程序,自动处理目标文件.