增城市荔城污水处理厂二期扩建工程

荔城污水处理厂设计规模为10万m3/d,已建一期工程为5万m3/d,二期扩建工程为5万m3/d,污水处理工艺采用脱氮除磷效果较好的CAST工艺;污泥处理采用机械浓缩加机械脱水一体化的污泥处理方式。介绍了污水处理厂扩建工程的处理工艺流程、工程设计参数、设备配置情况等。     

Modeling of bubble-layer thickness for formulation of one-dimensional interfacial area transport equation in subcooled boiling two-phase flow

In relation to the formulation of one-dimensional interfacial area transport equation in a subcooled boiling flow, the bubble-layer thickness model was introduced to avoid many covariances in cross-sectional averaged interfacial area transport equation in the subcooled boiling flow. The one-dimensional interfacial area transport equation in the subcooled boiling flow was formulated by partitioning a flow region into two regions; boiling two-phase (bubble layer) region and liquid single-phase region. The bubble-layer thickness model assuming the square void peak in the bubble-layer region was developed to predict the bubble-layer thickness of the subcooled boiling flow. The obtained model was evaluated by void fraction profile measured in an internally heated annulus. It was shown that the bubble-layer thickness model could be applied to predict the bubble-layer thickness as well as the void fraction profile. In addition, the constitutive equation for the distribution parameter of the boiling flow in the internally heated annulus, which was used for formulating the bubble-layer thickness model, was developed based on the measured data. The model developed in this study will eventually be used for the development of reliable constitutive relations, which reflect the true transfer mechanisms in subcooled boiling flows.     

Local flow measurements of vertical upward bubbly flow in an annulus

Local measurements of flow parameters were performed for vertical upward bubbly flows in an annulus. The annulus channel consisted of an inner rod with a diameter of 19.1 mm and an outer round tube with an inner diameter of 38.1 mm, and the hydraulic equivalent diameter was 19.1 mm. Double-sensor conductivity probe was used for measuring void fraction, interfacial area concentration, and interfacial velocity, and laser Doppler anemometer was utilized for measuring liquid velocity and turbulence intensity. A total of 20 data sets for void fraction, interfacial area concentration, and interfacial velocity were acquired consisting of five void fractions, about 0.050, 0.10, 0.15, 0.20, and 0.25, and four superficial liquid velocities, 0.272, 0.516, 1.03, and 2.08 m/s. A total of eight data sets for liquid velocity and turbulence intensity were acquired consisting of two void fractions, about 0.050, and 0.10, and four superficial liquid velocities, 0.272, 0.516, 1.03, and 2.08 m/s. The constitutive equations for distribution parameter and drift velocity in the drift-flux model, and the semi-theoretical correlation for Sauter mean diameter namely interfacial area concentration, which were proposed previously, were validated by local flow parameters obtained in the experiment using the annulus.     

The Solar Office in context

The goal of sustainability in buildings can only hope to be realised if buildings are designed to both conserve and generate energy. The Solar Office at Doxford International is designed to minimise the use of energy while its external fabric is designed to replace such energy that is used. The recently completed building is now subject of a comprehensive monitoring programme. The programme covers both the performance of the 73 kW_p photovoltaic installation and the environmental conditions within the building as a whole. Hour by hour findings are posted on a dedicated web site. Photovoltaics could have the same impact on building form and layout as the invention of the passenger lift at the end of the last century.     

低温运载火箭POGO抑制系统研究

在调研国外低温运载火箭抑制纵向耦合振动方案及结构的基础上,对各种可行性方案进行分析研究,从贮气型结构的气腔结构选型、消除温度对能量值的影响、低温绝热、低温结构密封、低温充气测压方案及注气型结构的注入气总量和单位流量的控制、充气测压方案等关键难点技术分析,对比双层整体套装波纹式蓄压器、双侧金属膜盒式蓄压器、囊式蓄压器、注气型蓄压器的先进性、继承性、复杂性、工作寿命、工艺性、经济性、使用维护性、可靠性等方面情况,分析对比结果表明,双侧金属膜盒式蓄压器是中国低温运载火箭抑制纵向耦合问题的最为合理可靠的方案.     

A gene variation of 14-3-3 zeta isoform in rat hippocampus

A variant form of 14-3-3 zeta was isolated from the rat hippocampal cDNA library. The cloned cDNA is 1687 bp in length and it contains an entire ORF (nt = 63-797) with 245 amino acids that is characteristic to 14-3-3 zeta subtype. By comparing with reported sequences of 14-3-3 zeta, we found three nucleotide substitutions within the coding sequence in our clone; C<-->T transition at nt = 325 and G<-->C transversions at nt = 387 and 388. Both are missense mutations, leading ACG (Thr) to ATG (Met) and CGT (Arg) to GCT (Ala) conversions at residue 88 and 109, respectively. Our results show that at least three different genetic variants of 14-3-3 zeta are present in rat species which results in protein variations. Such mutation in the amino acid sequence is an important indication of the diverse functions of this protein and may also contribute to the recent contradictory observations regarding the role of the 14-3-3 zeta subtype.     

我国大中城市中小套型住宅的节地性研究

随着我国城市化进展的加快,加之市场需求的增长,加大了城市土地资源的紧缺,从而使研究建造节地型住宅成为城市发展的必然。文章从住宅形式、高度、地下空间的利用、建筑组合的布局、住宅使用率与容积率,以及室内空间等诸多因素对住宅节地的影响,提出了住宅节地的方法。     

2016里约奥运会奥运村公园

正2016里约热内卢奥运村公园坐落于巴西里约热内卢市西部的巴拉达蒂茹卡地区,占地面积超过80万m2。在这里,佩德拉布兰卡国家公园(Pedra Branca State Park)中重要的大西洋森林植被保护区,与沼泽、浅滩等多样的自然环境类型,坎塔加卢、阿莫林和欧泰鲁山脉(Cantagalo,Amorim and Outeiro Hills)以及塔比乌斯(Tabebuias)环境保护区共同构成了当地独特的景观风貌。     

Niemenharju休息区

Niemenharju休息区位于欧洲E75高速公路上,该高速公路从欧洲南部的希腊一直延伸到欧洲北部的北开普.在漫长的驾驶之后,这里就成了过夜休息并欣赏自然的理想之地.休息区设立的灵感来自于周围的自然环境,因为该休息区毗邻一个美丽的大池塘和一个与科利马湖接壤的山脉(以芬兰语harju命名),该湖是冰河时代的遗迹.     

土耳其波斯坦利人行景观桥和日落休息室

正波斯坦利(Bostanli)人行景观桥和日落休息室由埃佛伦·巴斯布格建筑事务所(Studio Evren Ba?bu?Architects)设计,作为"伊兹密尔海(Izmir Sea)"沿海再生项目中"海岸(Kar??k?y?)"概念方案的一部分。波斯坦利溪流(Bostanli Creek)流入海湾的地方承载着这个城市独特的记忆,海岸线呈几何形。这两处景观构筑物在此作为自然景观的干预设施,位置相邻且彼此呼应,形成了一个极具吸引力的海岸新景点。自2016年7月开放以来,该场地深受城市居民的喜爱,已成为伊兹密尔市(Izmir)卡尔舍亚卡(Kar??yaka)