海水制盐的气象条件分析     

陆晓丽  黄汝红胡定 《广西气象》2006,27(4):50-53

通过对广西防城港市企沙盐场1996-2005年近10年的原盐产量与气象条件的关系进行分析，得出影响海水制盐的主要气象因子是降水、蒸发量、气温、大风，并提出各种气象条件下的生产对策及气象部门对盐业服务的思路和设想。  相似文献   

Geographies of production in 3D: Theoretical and research implications stemming from additive manufacturing     

《Geoforum》2015

Additive manufacturing (or 3D printing) is a comparatively new and evolving form of production that has the potential to transform the geographies of manufacturing. While this technology has garnered significant hype in the popular media, the topic has been virtually ignored in academic circles outside of business- and industry-specific, technology-oriented journals. Given its prospective impacts on the secondary sector and the potential for geographers to explore these transitions, this article provides a discussion of the possible opportunities for theoretical explorations and research into the place-based facets of additive manufacturing and its impacts on, or integration with, traditional manufacturing. In particular, we examine the spatial ramifications of this technology on supply, demand, innovation, global production networks, and the role of the state juxtaposed against contemporary insights pertaining to advances in additive manufacturing.  相似文献   

大伙房和柴河两水库的环境因子同鲢、鳙生长和产量变动的关系   总被引：2，自引：1，他引：2  

史为良  夏德昌  董双林  王立柱  刘兴河 《海洋与湖沼》1994,25(1):77-86

对辽宁省大伙房水库（１９８０－１９８７）和柴河水库（１９８１－１９８７）的水文、理化和生物数据，与这两座库同时间的不投饵网箱养殖的鲢、鳙鱼种的生长和产量进行回归分析。结果表明，７－８月的入库水量和出库水量、９月与６月间的水位差等参数同鲢，鳙均重及产量相关显著，用它们来估测大体鲢、鳙的生长与产量是可行的。  相似文献   

面向服务的信息化测绘关键问题探讨   总被引：1，自引：1，他引：0  

冯学兵  顾学明  范文革 《北京测绘》2008,(3):1-4

首先对信息化测绘的内涵进行了分析,提出了信息化测绘的服务本质,加强地理信息资源建设的关键任务,提出以数据库作为地理信息载体的观点;提出了信息化测绘建设的技术思路,总结了地理数据库的逻辑结构;对信息化测绘的组织运行方式提出了建议.  相似文献   

探采结合水井无固相环保冲洗液的研究与应用          下载免费PDF全文

张统得  蒋炳  樊腊生  房勇 《探矿工程》2020,47(6):1-7

探采结合水井需要实现精确获取水文地质参数和解决百姓饮水难题的双重目的,因此要求钻进施工中采用的冲洗液既要具备基本的护壁防塌等功能,还需最大程度地降低对地层渗透性的影响,同时还应具有优良的环保性能。针对这一特殊要求,研发了新型的PA—1型无固相环保冲洗液,采用渗透性实验、电镜扫描、砂球浸泡实验等多种测试手段对冲洗液进行了室内评价与分析,结果表明PA—1型无固相环保冲洗液对地层渗透性影响较小,防塌护壁能力强,综合性能优于常规冲洗液体系;采用中华米虾对其进行急性毒性实验也表明其安全无毒。大量室内实验及现场应用表明,PA—1型无固相环保冲洗液各项性能优良,可为今后在探采结合水井施工中冲洗液的合理选用提供参考。  相似文献   

西方“地方生产网络”相关研究综述   总被引：1，自引：0，他引：1  

马海涛  周春山 《世界地理研究》2009,18(2):46-55

生产网络是西方经济地理学的研究热点之一。其对全球经济的透彻解析所形成的全球生产网络概念已受到普遍关注,而作为地方经济分析工具的地方生产网络概念却明显受到忽视。本文参阅西方地方生产网络相关研究成果,对地方生产网络概念进行了梳理和界定,从构成与形态、内部关系、影响因素、外部连接、学习与创新、升级和演化等方面进行了评述,认为地方生产网络将会在分析地方经济内部结构、外部关系和创新能力等方面发挥更加重要的作用。  相似文献   

加拿大马更些冻土区天然气水合物试生产进展与展望   总被引：16，自引：0，他引：16  

祝有海 《地球科学进展》2006,21(5):513-520

马更些（Mackenzie）冻土区位于加拿大西北地区,是世界上最著名的天然气水合物产地之一,也是加拿大最重要的含油气盆地之一。在Mallik地区已相继钻探了L 38、2L 38、3L 38、4L 38和5L 38共5个钻孔,并进行了地质、地球物理、地球化学、微生物学和试生产等方面的多学科多方法研究,是目前全球天然气水合物研究程度最高、资料最丰富的地区。“Mallik 2002”项目开展了天然气水合物的短期试生产,共对6个水合物层位进行了降压法试生产并在其中的4个层位取得了成功,同时利用注入约80℃的热流体进行了5天多的加热法试生产,共生产出468 m3的天然气。“Mallik 2002”项目的成功实施是天然气水合物开发利用史上的里程碑,为将来的长期试生产和最终开发利用奠定了基础。随着开发利用研究的不断深入,天然气水合物这一规模巨大的潜在能源有可能在不久的将来为人类社会所用。  相似文献   

Distribution and cycling of dimethylsulfide (DMS) and dimethylsulfoniopropionate (DMSP) in the sea-surface microlayer of the Yellow Sea, China, in spring   总被引：7，自引：0，他引：7  

Hong-Hai Zhang  Gui-Peng Yang  Tong Zhu 《Continental Shelf Research》2008,28(17):2417-2427

The distributions of dimethylsulfide (DMS) and its precursor, dimethylsulfoniopropionate (DMSP), were examined in the surface microlayer and corresponding subsurface water of the Yellow Sea, China, in April 2006. The average concentrations of DMS and DMSP of dissolved (DMSPd) and particulate (DMSPp) forms were 5.42 (1.78–12.75), 9.22 (2.85–19.73) and 17.50 (4.33–36.09) nmol L⁻¹ in the subsurface water, and those in the surface microlayer were 4.92 (1.69–10.66), 17.08 (3.13–38.82) and 22.54 (4.85–47.24) nmol L⁻¹, respectively. The enrichment factor (EF) of DMS in the microlayer ranged from 0.47 to 2.24 with a mean of 0.98. In contrast, DMSPd and DMSPp appeared to be enriched in the microlayer with average EFs of 1.98 and 1.39, respectively. A close correlation of integrated DMS, DMSPp and chlorophyll a concentrations for compiled data from all stations in the microlayer and the subsurface water indicated that phytoplankton biomass might play an important role in controlling the distributions of biogenic sulfurs in the study area. Moreover, a statistically significant relationship was found between the microlayer concentrations of DMS, DMSP and chlorophyll a and their subsurface water concentrations, suggesting a close linkage between these two water compartments. Interestingly, we observed higher biological production rates and consumption rates of DMS in the microlayer relative to the subsurface water. Furthermore, the DMS production rates were closely correlated both with DMSPd and chlorophyll a concentrations. Our study showed that the major sink of DMS in microlayer was escape into the atmosphere, which greatly exceeded its bacterial consumption. A preliminary estimate for average flux of DMS from the Yellow Sea to the atmosphere was 6.41 μmol m⁻² d⁻¹ during spring.  相似文献   

Economic valuation for the conservation of marine biodiversity   总被引：3，自引：0，他引：3  

Beaumont NJ  Austen MC  Mangi SC  Townsend M 《Marine pollution bulletin》2008,56(3):386-396

Policy makers are increasingly recognising the role of environmental valuation to guide and support the management and conservation of biodiversity. This paper presents a goods and services approach to determine the economic value of marine biodiversity in the UK, with the aim of clarifying the role of valuation in the management of marine biodiversity. The goods and services resulting from UK marine biodiversity are detailed, and 8 of the 13 services are valued in monetary terms. It is found that a decline in UK marine biodiversity could result in a varying, and at present unpredictable, change in the provision of goods and services, including reduced resilience and resistance to change, declining marine environmental health, reduced fisheries potential, and loss of recreational opportunities. The results suggest that this approach can facilitate biodiversity management by enabling the optimal allocation of limited management resources and through raising awareness of the importance of marine biodiversity.  相似文献   

Dragged surge motion of tension leg platforms and strained elastic tethers     

Hsien Hua Lee  Pei-Wen Wang  Chung-Pan Lee 《Ocean Engineering》1999,26(6):145

This paper presents an analytical solution for the dynamic behavior of both the platform and tethers in the tension leg platform system when the platform system is subjected to the wave-induced surge motion and the flow-induced drag motion. Along with the analysis the coupling problem of a two dimensional tension leg platform interacting with a monochromatic linear wave train in an inviscid and incompressible fluid is being considered. The scattering problem and radiation problem are first solved independently and then combined together to resolve for all unknowns. The dynamic behavior of the platform and tethers was further solved based on these solutions. The material property and the dimensional effect for the tether incorporated in the tension leg platform system are both taken into account in the analytical analysis. Corresponding to the variation of material properties and tether dimensions, it was found that the dynamic behavior of both the tether of tension leg platform and the platform itself is closely related to the material property and the dimension of the tether.  相似文献