面向球面虚拟实景底部空洞的快速修补算法

本文提出一种针对球面虚拟实景底部空洞的快速修复算法,首先获取球面全景与球面虚拟实景间映射关系,并基于不同时刻球面虚拟实景间的空间位置关系建立位置映射模型,然后通过求解得到不同时刻球面全景之间的对应关系并实现缺失部分的修补,最后通过对修补区域亮度的调整及边缘融合,对修补结果进行优化.理论分析和实验结果均表明,该方法利用底部空洞位置固定这一特点建立复杂度仅为O(n)的修补算法,能够快速有效的实现球面实景底部空洞的修复.     

SVI简便快速测定法

详细介绍了ＳＶＩ快速测定法的原理和方法，并对实验数据进行了统计分析。结果表明，该方法准确、简便、快速且实用，可以替代传统方法。     

Filament content threshold for activated sludge bulking: artifact or reality?

An often-noted feature of activated sludge settleability is the existence of a threshold content of filamentous bacteria, below which filaments have a relatively small effect on settleability, and above which settleability is much more sensitive to filament content. This concept has historically been based on an apparent inflection point in settleability/filament content curves. However, this was demonstrated to be an artifact of data presentation on semi-logarithmic scales. Analyses of several published data sets indicated that there was little or no evidence of a threshold effect when data were presented on linear scales, particularly around the 150 mL/g sludge volume index (SVI) "threshold". Rather, there appears to be a generally continuous (and often nearly linear) relationship between filament content and SVI, suggesting that the threshold effect, as commonly perceived, is not accurate. A modified empirical model of filament content and settleability was also presented.     

基于主元分析的传感器故障检测与诊断

介绍主元分析方法在温度传感器故障检测与诊断中的应用。通过计算实际测量值和故障重构值及它们值的统计特性来识别故障类型；通过改进故障判别指数SPE及SVI，提高了故障检测与诊断的准确率。     

粗集理论在污水参数软测量中的应用研究

用粗糙集理论约简属性,消除冗余信息后建立了污泥体积指数的神经网络软测量模型.用某城市污水厂实际水质参数进行仿真实验.仿真结果表明,与未采用粗糙集进行预处理的模型相比,应用该模型不仅测量值的误差更小,而且输入参数从9个降至4个,大大降低了输入数据的维数,减少了神经网络的训练时间及训练步数,有利于软测量模型的实用化.     

Activated sludge treatment of abattoir wastewater—II : Influence of dissolved oxygen concentration

Performance of laboratory scale completely mixed activated sludge reactors fed with abattoir wastewater was measured at different dissolved oxygen (DO) concentrations. Degradation of fat present in the influent was inhibited at DO concentrations below about 0.5 mg l⁻¹, leading to sludges with high fat content which settled poorly due to excessive numbers of filamentous microorganisms. Fat was degraded rapidly at higher DO concentrations (up to 4.0 mg l⁻¹) and the sludge contained few filamentous microorganisms, a low fat content and settled readily. However, effluent quality was highest at low DO concentrations due to lower levels of soluble breakdown products from the fat.When wastewater was fed intermittently at constant aeration rate, sludge with a low fat content and good settleability resulted, even though the DO concentration was about 0.2 mg l⁻¹ for more than 30% of the time. Effluent quality was also high. Thus it is concluded that for full-scale abattoir treatment plants where wastewater flow is intermittent, DO concentration may be low during periods of high loading without adversely affecting effluent quality or sludge settleability.     

Pilot Scale Aerobic Sequencing Batch Reactor for Pig Waste Treatment

A n existing aetated lagoon treating piggery waste was converted into an aerobic sequencing batch reactor (SBR). After the commissioning period, the SBR plant treated piggery wastewater containing BOD and suspended solids (SS) concentrations of 2881 mg/l and 1419 mg/1 respectively, producing an effluent having an average BOD and SS of 18.7 mg/1 and 12.3 mg/1 respectively. The volumetric loadings on the SBR and the process were similar. However, the SBR process operated at a lower mixed liquor suspended solids (MLSS) concentration and shorter sludge retention period. Although the capital and operating costs of the SBR are higher than for the aerated lagoon, the simplicity of operation, the high BOD and SS removal efficiency, and the small land requirement make this type of process an attractive treatment option, particularly in places where land supply is limited and expensive.     

Required barrier efficiency of internal bags against the migration from recycled paperboard packaging into food: a benchmark

The use of recycled paperboard and corrugated board for food packaging is in the interest of the sustainability of resources, but in most applications the food must be protected against contamination from these materials, such as by an internal bag with a functional barrier. Producers of packaging need a specification to find the most suitable and economical barrier for a given application, and the customer needs the confidence that a solution offered to him is adequate. An accurate determination of the barrier efficiency is not possible due to the large number of migrants, most of which have not been evaluated or not even identified. Hence the specification must be based on assumptions and verifiable by a simple test. The proposed benchmark presumes that the migration of all non-evaluated or even unknown substances in recycled paperboard will remain below 0.01 mg kg^–1 food, the conventional detection limit, if their transfer does not exceed 1% of the content in the paperboard. Some substances, such as mineral oil or fatty acids, will exceed the 0.01 mg kg^–1 limit, but they are known, evaluated and of no concern at the reduced migration. Since the critical substances must be assumed to be unknown, the criterion of the 1% migration is tested with three surrogate substances of similar volatility and covering a broad range of polarity. The cornerstones of the method are specified.     

A／O工艺处理炼油厂海水和淡水混合废水的研究

对大连石化公司污水场处理海淡混合污水的工艺条件、运行方式、控制方法进行分析和研究，总结出操作规律。结果表明，使用A／O生物法处理该性质的污水是可行的；在启动运行上，污泥培养驯化方式上与常规工业污水驯化相同但控制条件不同；在工艺条件上，SWI低于100mL／g，但污泥增长较为缓慢；在控制条件上，要求原水的含盐量必须稳定在±5％的变化幅度以内；在处理效果上，污染物可以达到90％以上的去除率，满足国标一级排放标准的要求。