Influence of eco‐hydrological factors on aquatic plant succession in a regulated river: a case study of the Petchburi River,Thailand

Monitoring of aquatic plant biomass in the Petchburi River, a regulated river system in Thailand, was carried out together with the examination of eco‐hydrological characters and the sedimentary organic content. The surveys were performed during May, August and November of 2010 and 2011. The results indicated temporal variation in water velocity (0.08–2.51 m/s) and medium to low organic levels (0.58–4.68%) of the benthic substrates. Dominant aquatic plants were Hydrilla verticillata (L.F.) Royle and Potamogeton malaianus Miq. with the highest biomass of 70.84 and 182.72 g/m², respectively. The biomass was substantially decreased during the flood‐induced discharge period. This study indicates that Potamogeton has more adaptive potential to high water velocities than Hydrilla, while Hydrilla prefers lower water velocities. Discharge velocities of less than 0.5 m/s could provide positive growth rates of such submerged plants. Approaching the discharge control from this ecological point of view can further contribute to river habitat conservation.     

The characteristics of the bacterial community structure and population dynamics for phosphorus removal in SBR activated sludge processes

The characteristics of the bacterial community structure and population dynamics for phosphorus removal in activated sludge were investigated using laboratory-scale sequencing batch reactor (SBR) activated sludge processes fed with four different carbon sources. Phosphorus removal activity, quinone profile of the activated sludge and isolated bacterial strains were monitored. An enhanced phosphorus removal activity was accompanied by the increase in ubiquinone-9 (Q-9). The relationships between phosphorus removal activity and Q-9 contents of the isolated bacterial strains were dependent neither on the organic substrates nor on the species of isolated bacterial strains. The enhanced phosphorus removal capability of activated sludge seemed to be due to the increase in the populations of bacteria with activity of phosphorus removal, i.e. species succession of bacteria in activated sludge ecosystems, rather than the increase in the phosphorus removal capability of phosphorus removal bacteria. Not only Acinetobacter but also Pseudomonas identified from isolated strains were regarded as representative polyphosphates-accumulating organisms and predominant species to the whole of bacterial population in activated sludge for phosphorus removal.     

高层结构抗震分析的连续化方法

提出一种采用连续化方法对高层结构在水平地震作用下内力和位移的简化计算方法。把高层结构看作一个竖向悬臂剪弯梁,得到前三阶振型和频率,按振型分解反应谱法基本原理,推导出高层结构内力和位移的计算公式和表格。文中还给出一个算例,并与底部剪力法对比分析以表明此方法的优越性,供设计人员参考。     

城市非正式绿地：概念、类型、价值及更新设计模式研究

为了解决存量背景下高密度建成区“无缝插绿”的困境,对目前关注较少的非正式绿地的概念、类型、价值和更新设计模式进行系统研究。对web of science及中国知网数据库的63篇中英文文献进行分析。非正式绿地具有无人管理及覆盖自发生长植被的特征,可分为面状、线性及点状绿地,具有增强绿色基础设施韧性、提升绿地公平性、增加城市生物多样性、营造居民安全健康社区环境等重要价值,居民对非正式绿地喜好存在偏差,研究表明该偏差与受访者年龄、受教育程度等个体特征密切相关。非正式绿地是城市绿地（广义）的一种重要类型,具有用地转变、低扰提质、界面融合三种更新设计模式。     

塑造具有文化特质的城市酒店—从深圳湾大酒店到华侨城洲际大酒店

以深圳华侨城洲际大酒店的建设为例,探索超前、独特的酒店文化。提出：城市豪华酒店应对城市的文化积淀、历史保护、文脉延续有所贡献;酒店建筑是城市建筑的“气孔”,酒店建筑要带动周围的文化环境;成功的酒店建筑一定只属于它所在的地域;酒店要创造一种全新的生活方式,激发起新的生活模式。     

强化建筑文化的民族个性提升建筑的文化价值

在全球化的背景下,对于作为一种独特的传统文化思想和民族特征的形式存在的中国传统建筑文化的继承,只有站在传统哲学思想的高度思考现代建筑与传统文化的内在关联,才能在深层次上把握与创新传统.     

中国传统建筑文化的继承问题

作为一种独特的地域或民族特征的形式存在的中国传统建筑文化,在全球化的背景下,具有呈现并张扬世界文化多样性的重要价值.对传统建筑文化的继承,只有站在哲学的高度思考现代建筑与传统文化的内在关联,才能在深层次上把握与创新传统.     

近年中国油气勘探开发形势及发展建议

近年来,中国的石油年新增探明储量明显下降,以致出现新增可采储量小于当年产量的情况,年产量也连续5年降至2×10⁸t以下。2015—2019年的平均勘探开发投资处于低谷是近年来石油储量、产量处于降势的原因之一。中国天然气快速发展期的出现比石油晚一个"相位",目前仍处在快速发展的平台上。中国页岩气近10年来已获得良好的起步,但应看到已获得的探明储量仅限于四川盆地东南部的五峰组—龙马溪组页岩。鄂尔多斯盆地西南部延长组7油层组已获得页岩油探明储量并开始建设开发实验区,准噶尔盆地吉木萨尔凹陷芦草沟组页岩油也获得重大突破并有望在储量、产量上取得大的进展,但应注意到中国页岩油的开发难度大、经济开发门槛高。致密(砂岩)油气是近期中国非常规油气中可望获得较快进展的领域,其中,鄂尔多斯盆地和四川盆地是其增储上产的主力地区。煤层气的进展与最初的期望差距较大,需要对其赋存条件和开发技术作认真研究。建议尽快实施油气生产的新一轮战略接替评价,并提出了5个优选区和领域;倡议设立勘探基金以支持开拓性的勘查项目,提出应以服务市场经济为导向对储量审定的相关规范进行补充修改。     

稳态工作条件下功率晶体管结温的测量与控制

为了在试验周期中了解晶体管的结温,提出一种在功率晶体管稳态工作寿命试验过程中结温的测量与控制方法.着重介绍了基于理想pn结肖克莱方程的结温测量原理,及试验过程中结温测控的技术难点和解决方案,指出了晶体管结温计算中存在的问题和修正办法,实验结果证明了该方法的可行性.     

陆相断陷盆地沉积相律与油藏类型序列类比分析

在分析沉积相律的基础上，通过陆相断陷盆地输导体系控制的油藏分布连续性分析与油藏类型分布序列分析，指出陆相断陷盆地油藏分布序列与沉积体系分布序列相对应，在一定的时空格架内既具有连续性特征，又具有侧向相邻、纵向叠置的分布规律。陆相断陷盆地沉积相序与油藏类型分布序列不仅具有特征上的相似性，并且还具有内在成因上的规律性联系，即都是由断陷盆地构造一沉积充填特征及其所决定的输导体系特点所控制的。