利用白云石提供钙镁源从污泥厌氧消化液中回收磷

为探讨利用白云石提供钙镁源从污泥厌氧消化液中回收磷并获得富磷回收产物的工艺方法与条件,采用白云石为填料的钙镁溶出系统,考察了系统在不同的厌氧消化液进液流量、气水体积比、体积回流比条件下运行9 h后溶出的Ca2+、Mg2+浓度状况及在反应pH=9.0时的磷回收效果。试验结果表明,白云石钙镁溶出系统适宜的工艺条件为进液流量2.0 BV/h、气水体积比20.0和体积回流比5.0,溶出液Ca2+、Mg2+浓度分别为230.01 mg/L和76.30mg/L,厌氧消化液磷回收率达到97.35%,氨氮回收率12.97%,回收产物的含磷率(以P2O5计)和含氮率分别为40.78%和0.20%。经XRD、FTIR、SEM和EDS分析表征,回收产物以磷酸钙盐和磷酸铵镁为主要成分。研究表明,利用白云石提供钙镁源可以有效地回收污泥厌氧消化液中的磷并回收部分氮,且回收产物含磷率高,杂质少。     

A GIS-based decision support system for risk assessment of wind damage in forest management

In this study a GIS-based decision support system (DSS) was built for assessing the short- and long-term risk of wind damage in boreal forests. This was done by integrating a forest growth model SIMA and a mechanistic wind damage model HWIND into geographical information system software (ArcGIS 8.2) as a toolbar (DLL) using ArcObjects in ArcGIS and Visual Basic 6. In this DSS complex problems are solved within program so that forest gaps, edge stands and edges are automatically tracked when the forest structure changes over time as a result of forest growth dynamics and management. This DSS can be used to assess the risk of wind damage to Scots pine (Pinus sylvestris), Norway spruce (Picea abies) and birch (Betula spp.) stands, regarding the number of stands and area at risk and length of vulnerable edges of these risk stands at certain critical wind speed classes (i.e. corresponding the maximum wind speed a tree/stand can resist). This DSS can helps forest managers to analyse and visualise (charts, maps) the possible effects of forest management, such as clear-cuts, on both the immediate and long-term risks of wind damage at both stand and regional level.     

Global R&D Needs in Drying

This paper summarizes some recent advances and general trends in drying technologies of industrial interest. The process of innovation is applied to drying R&D. The conventional drying techniques are compared with the innovative technologies. Numerous emerging technologies are listed and some examples are discussed in detail. Potential application areas for the new technologies are identified.     

“十里红妆”家具色彩文化探析

通过对中国传统的尚红、民俗婚庆的喜红和家具用材的重红色彩观念分析,探讨了浙东地区十里红妆家具形成的因由及其所蕴含的色彩文化内涵,从而对当代中国家具的色彩设计提供参考原型。     

论“形态追随行为”形态观

本文探讨了“形态追随行为”（form follow action）形态观的概念、形成和基本的内容。研究表明，设计师的“形态追随行为”形态观是从人的生理、心理和社会的层面来研究人的行为和习惯对人造物形态的影响，以及这种影响所形成的产品形态又是如何与使用者发生关联的。     

抽样计划中接收质量限（AQL）的确定

接收质量限是产品抽样计划中的一个重要参数.本文探讨了GB/T 2828.1-2003中AQL的内涵和特点，分析了确定AQL所需要遵循的基本原则，论述了运用过程平均法、参照法、反推法和以产品合格品率等来确定AQL的方法。     

三维建模在文化展示建筑及其景观施工中的应用

以一公共历史文化展示建筑及其景观工程为例,阐述三维建模在工程施工中的应用.通过采用三维建模方案,确保历史文化展示建筑及其景观工程施工的准确度与整体效果.     

Moisture Distribution Changes and Wetwood Behavior in Subalpine Fir Wood during Drying Using High X-Ray Energy Industrial CT Scanner

In some species, such as subalpine fir (Abies lasiocarpa [Hook] Nutt), the water content of the confined zones in heartwood is as high as or greater than that of sapwood. Such wet zones of heartwood are referred to as “wetpocket” or “wetwood.” Wood products from subalpine fir forests are adversely affected by the wetwood-associated problems, particularly during the drying process. The objectives of the study were as follows: (1) to investigate feasibility of a high X-ray energy industrial computed tomography (ICT) scanner for imaging wetwood; and (2) to determine changes of the 2-D and 3-D moisture profiles (from core to shell) at different drying times.

Although medical CT scanning has been used for attaining signal intensity profiles of typical wood at different drying times, the technology has not, to date, been used for the study of wetwood phenomenon. This study presents, for the first time, results from the ICT imaging of the wetwood phenomenon. The results indicate that the ICT imaging system provides a powerful technique for imaging wetwood at different drying times. In addition, the results show that during the initial phase of drying, almost flat moisture profiles were observed in all wood types except for the wetwood, which showed a relatively higher moisture profile. A much slower (sluggish) drying development pattern at each increment from core to shell was found within the wetwood zone than normal wood regions along the width, thickness, and length of the board.     

谈厨房空间的无障碍设计

深入分析老年人的生理特点和活动规律,结合室内设计中人体工程学和心理学的相关知识,分析厨房设计中存在的问题,并且运用无障碍设计的方法,为老年人设计一个更加人性化的厨房环境,确保老年人在厨房空间的方便和安全,提高老年人的自理能力和自信心。