Real-time Parallel Processing System Design and Implementation for Underwater Acoustic Communication Based on Multiple Processors

ADSP-TS101 is a high performance DSP with good properties of parallel processing and high speed. According to the real-time processing requirements of underwater acoustic communication algorithms, a real-time parallel processing system with multi-channel synchronous sample, which is composed of multiple ADSP-TS101s, is designed and carried out. For the hardware design, field programmable gate array （FPGA） logical control is adopted for the design of multi-channel synchronous sample module and cluster/data flow associated pin connection mode is adopted for multiprocessing parallel processing configuration respectively： And the software is optimized by two kinds of communication ways： broadcast writing way through shared bus and point-to-point way through link ports. Through the whole system installation, connective debugging, and experiments in a lake, the results show that the real-time parallel processing system has good stability and real-time processing capability and meets the technical design requirements of real-time processing.     

桂林桂湖浮游藻类种群组成及水质生物学评价

根据2013年1～12月对桂湖浮游藻类的调查和监测结果,分析藻类种群组成和优势种、细胞密度、马卡列夫（Margalef）和香农—韦弗（Shannon-Weaver）生物多样性指数等生物特征参数的变化,从生物学角度对桂湖水质进行评价,为桂林两江四湖水环境的综合治理和生态保护提供基础资料和理论依据。     

ASSESSMENT OF CONSEQUENCES OF SEDIMENT DEFICIT ON A GRAVEL RIVER BED DOWNSTREAM OF DAMS IN RESTORATION PERSPECTIVES: APPLICATION OF A MULTICRITERIA,HIERARCHICAL AND SPATIALLY EXPLICIT DIAGNOSIS

As regards river restoration, it is fundamental to better link human pressures and environmental responses and to take into consideration not only target species or habitat but diverse ecological elements. This permits to assess sustainable restoration plan, especially concerning sediment augmentation below dams. The use of a hierarchical multicriteria approach on the Ain River permits us to assess a diagnosis of sediment deficit impact integrating several morphological (channel shifting, river bed degradation and river bed coarsening) and ecological components (Riparian and floodplain lake and fish communities). Our diagnosis also integrates a temporal and spatial approach better to link human pressures and environmental responses and to identify the dam effects amongst other drivers (e.g. grazing decline and channel regulation). The results confirm causality links between sediment deficit and slight channel bed degradation (0.01 m.year^?1) or channel bed paving and thus highlight the impact of the dam on the drying of the riparian forest and on former channel community. However, the relationship between incision and reduction in active channel lateral mobility is more difficult to establish. The role of sediment deficit in the current variability of the riparian regeneration capacity and, thereby, landscape diversity along the lower valley remains unclear. This study also confirms the relevance of using different ecological indicators, notably because all components present different adjustment time scales, whereas some of them are more sensitive to other impacts. Copyright © 2013 John Wiley & Sons, Ltd.     

基于MODIS影像的洞庭湖枯水期总磷营养状况监测研究

为了解洞庭湖区枯水期的水体总磷的污染情况,利用MODIS反射率与同步的总磷(TP)浓度实测数据进行相关性分析,得出最优波段组合b1-b5。建立了三次多项式反演模型,并运用模型反演得到2005、2009及2013年枯水期3期洞庭湖区总磷的分布图,湖区水体主要以Ⅳ类水质和Ⅴ类水质为主,进一步采用以TP为基准的修正营养指数(TSIM)公式得出洞庭湖区的营养状态分布情况。结果表明:2005-2013年洞庭湖水体营养指数呈现略下降又上升的趋势。洞庭湖区湖水趋于富营养化状态,且东洞庭湖最严重,南洞庭湖次之,西洞庭湖最轻,洞庭湖湖体水质劣于入湖口水质。     

引黄河向白洋淀补水效益分析

保持白洋淀的水生态,对于华北地区的生态环境和社会经济发展有重大意义。白洋淀的反复干淀,引起了各级领导和广大群众的关注,要求水利部门从根本上扭转这种局面,建立保持白洋淀水生态的长效机制。2006—2009年从黄河调水保证了白洋淀水生态环境的持续健康,取得了显著的经济效益和社会效益。     

山东山旺国家地质公园地质遗迹特征及地学意义

山东山旺国家地质公园以特异埋藏的古生物化石、典型的中新世地层剖面和完整的玛珥湖充填为代表,在世界范围内都具代表性,极具研究价值。本文在前人研究基础上,对园内地质遗迹资源按照《地质遗迹调查规范》(DZT 0303-2017)进行了重新分类,总结了地质公园的地质遗迹特征,尤其对地质公园产出的古生物化石分门别类进行了综述,后对地质公园地质遗迹资源的古生物学、地层学、沉积学、火山地质学的研究意义进行了探讨。本文工作可以为山东山旺国家地质公园在新一轮自然保护地体系建设工作中的保护、规划及研究提供参考价值。     

清洁底泥吹填技术及其在滇池福保湾的应用

浅水湖泊直立沿岸带一般具有水深岸陡、水体污染严重、底泥不利于水生植物生长等特点,生态恢复困难.为了修复受损的浅水湖泊直立沿岸带,结合在滇池福保湾的生态恢复实践和国内外的相关研究,提出采用清洁底泥吹填技术减少水深、改善底质性状、创造多样性地形,为水生植被恢复创造有利的生境条件.清洁底泥吹填技术的工艺流程为,首先对工程区周边进行勘察,确定泥源;接着选用合适的疏挖设备按工程区基底修复设计的要求进行吹填施工;最后在基底修复满足设计要求的前提下实施水生植被种植等工程.该技术在滇池福保湾的应用显示,吹填工程实施2年后,工程区内水生植物得到初步恢复,恢复效果明显好于未采用该技术的恢复区.     

我国城市湖泊风景区发展状况及规划设想

通过规划设计,引导城市湖泊风景区与现代城市亲和,要使其功能满足城市居民的需要,避免城市化给风景区带来破坏,使城市湖泊风景区发挥其生态优势,促进城市和谐发展。     

九江市城区河湖水质现状及污染防治对策

水是生命之源,城市依水而建,城市河湖的水环境影响着整个城市人口的生活环境,也体现一座城市的文化品位．文章分析了九江市城区河湖的水质现状,并提出了防治对策．     

258.15 K下五元体系Li+,Na+,Mg2+//SO42-,Cl--H2O相平衡研究

中国含锂盐湖大部分位于青藏、新疆等干旱少雨、冬季寒冷且漫长的地区。为指导低温提锂工艺的开发和设计、利用冬季冷能进行目标离子的富集及明确含锂盐湖在低温下的析盐规律,采用等温溶解平衡法对258.15 K、二水氯化钠饱和条件下的交互五元体系Li⁺,Na⁺,Mg²⁺∥SO₄^2-,Cl^--H₂O相平衡关系进行研究并构建等温平衡相图。结果表明,相图中有4个共饱点、6个两盐结晶区(NaCl·2H₂O+Na₂SO₄·10H₂O、NaCl·2H₂O+MgCl₂·8H₂O、NaCl·2H₂O+MgSO₄·7H₂O、NaCl·2H₂O+Li₂SO₄·H₂...