高速冷镦机的动平衡研究

本文探讨了高速冷镦机的振动力、振动力矩、输入扭矩波动的合理平衡途径,首次提出了利用平衡机构与配重进行动平衡的综合方法,并在凹模回转高速冷镦机上进行了验证。     

浦东国际机场空调系统诊断与改善

针对浦东机场前年夏季部分空调区域出现较热的现象，对空调系统现状进行了调查，分析造成这一现象的原因。对发现的水力失调等问题进行了相应的整改。整改后的流量分配趋于合理，室内温度基本满足了要求。     

安装施工现场对转子进行动平衡的方法

回转另部件在安装时有时会碰到动平衡问题,一般是送平衡实验室在平衡机上做平衡,详细介绍了在安装现场、在转子自身轴承中做平衡的方法。     

A preliminary modeling analysis of water quality in Lake Okeechobee, Florida: Calibration results

To gain understanding of nutrient and phytoplankton dynamics in Lake Okeechobee, Florida, we developed and applied a deterministic, mass balance, water quality model at the whole-lake spatial scale. The model was calibrated to a comprehensive set of field data for 1985–1986, and then used to simulate the period 1973–1992. The model represented the mean behavior of in-lake total phosphorus, dissolved available phosphorus, total nitrogen and chlorophyll a concentrations reasonably well during the calibration period. The model did not represent dissolved available nitrogen concentrations very well, nor did it capture much of the observed temporal variability during the calibration period. The model results identified important information needs to improve our understanding of the nitrogen cycle including, sediment-water nitrogen fluxes, denitrification and nitrogen fixation. Results from the 1973–1992 simulation indicated that model assumptions and/or calibration parameters were not uniformly applicable over this period. Total phosphorus concentration results from this model were compared with results from two site-specific, empirical loading models for the lake. None of these models represented annual average concentrations uniformly well over the entire 20-year period, and none captured much of the observed inter-annual variability. External total phosphorus loadings and lake hydrology are not sufficient to fully describe total phosphorus dynamics in Lake Okeechobee. Other important factors are diffusive sediment-water fluxes, wind-induced sediment resuspension, and the spatial heterogeneity in the lake.     

A/O复合式生物膜工艺缺氧段的动力学模型

对A/O复合式生物膜工艺的缺氧段进行了深入研究,并以物料平衡理论为基础,结合莫诺方程和Fick定律,建立了相应的底物降解和微生物增殖的动力学模型.算例结果表明,理论值与试验所得数据有相似的变化趋势,但两者间存在一定的偏差,而且随着进水有机物浓度的增加,其偏差逐渐加大,不过最大偏差率仅为13%,说明模型与实际情况符合较好,比较准确地预测了缺氧段的运行效果,这为该工艺的设计、运行和控制提供了较好的理论基础.     

沈阳市图书馆和儿童活动中心

从规划、建筑等方面介绍了沈阳市图书馆和儿童活动中心的全态,阐述了对城市空间进行整理的规划设计过程和采用“阴阳交替”的办法来寻求“平衡”的建筑设计理念。指出城市的更新和发展应是个在众多的不平衡中去寻找、发现并建立新平衡的过程。     

旧建筑再利用——以重庆第一中学实验楼改造为例

分析了旧建筑再利用具有的特点、意义,并以重庆一中实验楼改造为例解析其中遇到的问题和处理方式。认为只要能够满足当前的使用需求,旧建筑再利用无疑是城市更新的上佳策略,而如何在“新”与“旧”之间取得一种适当的美学平衡．始终是旧建筑再利用需要面对的核心问题。     

谈"特吉巴奥文化中心"的生态设计

建筑大师R·皮阿诺(意)在特吉巴奥文化中心的设计中,充分挖掘和利用当地的文化传统与自然资源,在被动式通风系统的设计、自然材料的选择、天然光线的利用等方面,通过高科技手段,达到了与自然的生态平衡,给予当今生态设计理念有益的启迪。     

Removal of bis(2-ethylhexyl) phthalate at a sewage treatment plant

Bis(2-ethylhexyl) phthalate (DEHP) concentrations were measured at different stages in a full-scale sewage treatment plant (STP) and mass balances were calculated. The DEHP load to treatment process coming from the sewer system and the internal load comprising returned supernatants and filtrate from sludge treatment and excess secondary sludge were at the same level. The DEHP removal efficiency from the water phase at the STP was on average 94% of sewage DEHP, the main removal process being sorption to primary and secondary sludges. On average 29% of DEHP was calculated to be removed in the biological nitrifying-denitrifying activated sludge process, which was much less than expected from laboratory biodegradation studies described in literature. Monoethylhexyl phthalate, the primary biotransformation product of DEHP, was not detected at any treatment stage. Approximately 32% of DEHP in sewage was removed during anaerobic digestion of the sludge, while 32% remained in the digested and dewatered sludge.     

基于箱式模型的地下车库通风量确定方法

根据全面通风的质量平衡定律，基于室内空气污染物质量平衡方程的箱式模型，采用视车道为线源的污染物点源计算方法计算出地下车库内汽车尾气CO的排放量，由此推导出地下车库通风量的动态计算公式。结合某一具体工程进行计算和分析表明：该方法较以往各国常用的体积换气次数法和单位地面面积法更能真实反映地下车库通风量的动态变化，切合实际。说明本文提出的基于箱式模型的地下车库通风量确定方法及其结构是正确的，为在实际条件下方便而正确地得到用于通风节能控制目的的地下车库通风量确定找到了一种新的方法。本文的实验测量和理论分析方法都比较简单，可以直接推广于工程实际中。