基于SD模型的深圳市水资源承载力研究

基于深圳市社会、经济、环境现状,在综合考虑水资源质和量的基础上,采用系统动力学方法建立深圳市水资源承载力模型,并对深圳市水资源承载力进行计算评价,结论是深圳市水资源承栽力普遍小于1。通过对16种方案的计算比较,提出进行产业结构调整、提高污水处理水平、提高节水程度、加强人口控制可以有效地提高深圳市水资源承载力,到2030年,其值能接近于1。     

茅洲河流域再生水的综合优化配置

对深圳市茅洲河流域工业生产、农业灌溉、城市绿地浇灌、道路广场浇洒以及居民冲厕等方面的再生水需求进行分析,建立包括4个再生水厂、35个再生水用水片区的再生水优化配置模型,并运用LINGO求解其全局最优解。结果表明:①茅洲河流域再生水厂的生产能力为59.4万m3/d,仅能满足该流域污水处理需求的51.7%;②农业灌溉、工业回用、城市绿地浇灌、道路广场浇洒、居民冲厕等行业使用再生水的边际收益分别为3.7元/m3、21.6元/m3、4.1元/m32、.1元/m3、1.3元/m3。     

Simulating multiple class urban land-use/cover changes by RBFN-based CA model

Land use systems are complex adaptive systems, and they are characterized by emergence, nonlinearity, feedbacks, self organization, path dependence, adaptation, and multiple-scale characteristics. Land use/cover change has been recognized as one of the major drivers of global environmental change. This paper presents a coupled Cellular Automata (CA) and Radial Basis Function Neural (RBFN) Network model, which combines Geographic Information Systems (GIS) to contribute to the understanding of the complex land use/cover change process. In this model, GIS analysis is used to generate spatial drivers of land use/cover changes, and RBFN is trained to extract model parameters. Through the RBFN-CA model, the conversion probabilities of each cell from its initial land use state to the target type can be generated automatically. Future land use/cover scenarios are projected by using generated parameters in the model training process. This RBFN-CA model is tested based on the comparison of model output and the real data. A BPN-CA model is also built and compared with the RBFN-CA model by using a variety of calibration metrics, including confusion matrix, figure of merit, and landscape metrics. Both the location and landscape metrics based assessment for model simulation indicate that the RBFN-CA model performs better than the BPN-CA model for simulating land use changes in the study area. Therefore the RBFN-CA model is capable of simulating multiple classes of land use/cover changes and can be used as a useful communication environment for stakeholders involved in land use decision-making.     

龙岗河干流综合治理工程防洪规划与设计研究

从河道的生态功能及社会功能入手,分析了城市对河道的要求。以此为基础,探讨了在河流综合整治中如何实现城市防洪与景观生态的协调统一。结合深圳市龙岗河干流综合整治工程实例,从防洪标准确定、洪水流量设计、干流断面设计、岸坡防护设计等不同层面介绍了生态型城市河道防洪建设的设计理念与设计方法。     

Temperature stable 0.35Ag2MoO4-0.65Ag0.5Bi0.5MoO4 microwave dielectric ceramics with ultra-low sintering temperatures

In this study, the novel temperature-stable (1-x)Ag₂MoO₄-xAg_0.5Bi_0.5MoO₄ microwave dielectric ceramics were prepared by a modified solid-state reaction method. The phase composition, microstructures and microwave dielectric properties of the (1-x)Ag₂MoO₄-xAg_0.5Bi_0.5MoO₄ ceramics were investigated. All the compounds can be sintered well at ultra-low temperatures (<540 °C). The XRD and SEM analysis indicate that the Ag₂MoO₄ and the Ag_0.5Bi_0.5MoO₄ can coexist with each other. When x = 0.65, the ceramics exhibit the best microwave dielectric properties with a relative permittivity of 23.9, a Q × f value of 16,200 GHz (at 7.3 GHz) and a near-zero TCF value of -2.4 ppm/°C at 520 °C. The results indicate that temperature-stable (1-x)Ag₂MoO₄-xAg_0.5Bi_0.5MoO₄ ceramics are promising candidates for low temperature co-fired ceramics (LTCC) applications.     

State-led technological innovation of domestic firms in Shenzhen,China: Evidence from liquid crystal display (LCD) industry

Since 2000, particularly in the aftermath of the global financial crisis, there has emerged revisit of the role of the state in technological upgrading of latecomer cities and regions in developing countries, including China. The effectiveness of a technological innovation strategy driven by transnational corporations (TNCs) has been questioned, despite its significant contribution to rapid industrialization via strategic coupling in the global production networks (GPNs). There has been a paradigm shift of innovation policy towards indigenous innovation through state-led explicit coupling of designated domestic firms and lead firms in the GPNs. The practice of this remains understudied, however. By examining the development of the liquid crystal display (LCD) industry, one of the strategic emerging industries (SEIs) in Shenzhen, this paper sheds light on the collective roles of various state authorities ranging from the central to provincial and municipal governments in fostering technological innovation of domestic firms (e.g. CSOT) through explicit coupling with global lead firms (e.g. Samsung). The empirical experience in Shenzhen indicates that indigenous innovation focused on domestic firms may unnecessarily exclude the participation of TNCs. This study urges more research to examine the changing dynamics of technological catch-up of domestic firms in an increasingly globalized and uncertain world economy.     

深圳湾科技生态园建筑设计分析

本文介绍了深圳湾科技生态园四区建筑的总体布局及设计理念、交通组织、功能设计、生态办公空间及节能设计、景观设计及消防设计,以供读者参考。     

新加坡私人组屋计划对深圳企业参建保障性住房的启示

深圳作为中国对外开放的先行地区,通过投融资方式改革,逐步进行了企业参建保障性住房的探索,深圳市住房和建设局也启动了对此项举措的专项研究,但由于处于探索的初级阶段,问题和困惑较多。本文通对新加坡私人组屋计划的剖析,探究新加坡私人组屋计划实施后停止的原因,总结经验教训,为深圳企业参建保障性住房提供借鉴。     

多支护结构在深圳珠江广场深基坑工程中的应用

通过深圳珠江广场深基坑工程实例，介绍了根据场地周边不同条件分别采用不同支护方案的设计思路。在该工程中，多支护结构的综合利用成功地在复杂的施工环境下保证了基坑和周围建筑群及地下管线的安全．而且降低了成本，缩短了工期。     

龙岗区生活垃圾分类现状及对策研究

通过调查深圳龙岗现有城市生活垃圾分类现状和收运模式,分析其存在的问题和成因,提出深圳市龙岗区生活垃圾分类处理的策略。