Effect of different substrate concentrations and salinity on hydrogen production from mariculture organic waste (MOW)

In this paper, the influence of substrate concentrations and salinity on hydrogen production from mariculture organic waste (MOW) at mesophilic condition in batch reactors was determined. It was found that the hydrogen yield and hydrogen content were influenced by the initial substrate concentrations and salinity. The optimum concentration for hydrogen production was 20 g/L. The salinity could produce inhibit effect for hydrogen production. The low hydrogen content was detected at high salinity condition. The nutrients changing and metabolites composition could also be significantly influenced by the salinity. The releasing of carbohydrate from MOW could be easily used for hydrogen production, and protein could be accumulated and assimilated during the hydrogen fermentation. The enhancing of salinity was disadvantage for total metabolites accumulation.     

某水库排沙孔检修闸门更换方案比选研究

结合某70 m高混凝土双曲薄拱坝排沙孔进口检修闸门更换的方案比选,详细对比了放空水库方案与水下更换方案的优缺点。对比发现,两方案均不可行。放空水库方案主要是因为非技术方面的原因无法采用,水下浮体门封堵方案则存在一系列风险和限制条件,不适宜在本工程中采用。因此,下一步应加强水下修补技术的研究。     

Effectiveness analysis and optimum design of the rotary regenerator for thermophotovoltaic (TPV) system

The influence of the period of rotation on the effectiveness of the thermophotovoltaic (TPV) rotary regenerator was theoretically and experimentally investigated.It was found that the deviations of the...     

中国建筑业分行业资本存量测算

结合国家和建筑行业相关统计数据,并综合有关研究成果确定关键指标,采用永续盘存法对我国建筑业1980～2009年的资本存量进行测算,同时对分行业资本存量进行比较分析。结果表明我国建筑业资本存量总体呈逐年上升趋势,房屋建筑业和铁路、公路、隧道、桥梁行业的增长速度要明显高于其他行业。     

论对自然资源“圈占”行为的规制——以云南风景名胜资源开发管理为例

当前,我国出现一轮"圈占"自然资源热,国有重点自然资源多由管理区(如风景名胜区、自然保护区、各种国家公园等)以"特许"方式转让,集体自然资源通过"四荒"拍卖、承包、租赁等方式,以低价分割"圈占"。云南素有"植物王国""动物王国"之美誉,境内多处被列为生态功能区和禁止开发区,是国家重要的生态安全屏障,但风景名胜等资源"圈占"情况相当突出。资源"圈占"不仅关系云南可持续发展和国家生态安全,也关乎公平正义。规制自然资源"圈占"不仅要贯彻科学发展、完善法律制度、科学编制规划、强化监督机制,更要鼓励引导支持公众参与,推进集体资源自主化管理。     

磨削模架产生的问题及解决方法

导柱、导套属于模架的配合件,其加工的尺寸精度和形位精度要求很高,零件之间要相互配合.针对磨削导柱、导套出现的问题提出一些解决方法,从而提高了加工效率,保证了导柱、导套的配合精度.     

曝气沉砂池的除砂性能研究

对南方某污水厂曝气除砂系统的处理性能进行了研究。结果显示:1进水含砂、砂斗沉砂和砂水分离器出砂的粒径级配差异明显,曝气沉砂池对粒径0.15 mm的砂粒去除率较高;2砂粒在曝气沉砂池底的分布并不均匀,大部分砂粒沉降于池底后半段,其中粒径为0.1~0.2 mm的砂粒主要分布于池底中间位置,而粒径为0.2~0.6 mm的砂粒主要分布于池底后端,砂粒的沉降并不完全符合自由沉淀理论;3曝气不利于砂粒的沉降,曝气强度对除砂率的影响存在最佳值,该曝气沉砂池的最佳曝气量范围为100~150 m3/h;4曝气量一定的情况下,水平流速对除砂率的影响要大于停留时间的影响。     

广西那比水电站环境敏感问题分析及防治措施

通过全面了解那比水电站工程概况及项目区环境概况,对本工程建设的主要环境敏感问题,包括工程建设对河流水文情势的影响、那比水电站库区渭寒沟金矿对库区水质的影响以及工程建设对库区生态环境的影响进行分析,在此基础上提出减免主要环境不利影响的措施,并通过采取有效措施,将项目建设带来的对环境不利的影响降到最低限度,从而为环境所接受。     

URBAN BUILT ENVIRONMENTS,ACCESSIBILITY, AND TRAVEL BEHAVIOR IN A DECLINING URBAN CORE: THE EXTREME CONDITIONS OF DISINVESTMENT AND SUBURBANIZATION IN THE DETROIT REGION

The research explores the impact of socioeconomic and racial variables on accessibility to urban amenities and travel in compact urban built environments that have traditionally been viewed as improving access to daily destinations and promoting nonmotorized travel: urban environments characterized by high densities, mixed land uses, and high connectivity. The study focuses on six neighborhoods in the Detroit region. Two neighborhoods are within the city itself, and predominantly poor and Black, and four of the neighborhoods are in the region surrounding the city, and they are predominantly wealthy and White. This study at the neighborhood scale enables an analysis into how class and race affect accessibility and travel in neighborhoods experiencing urban disinvestment and decline. The research shows that the traditional relationship between high densities, mixed land uses, high connectivity, greater accessibility, and pedestrian activity is significantly weaker in declining inner cities.     

湿法磷酸工业中不锈钢应用综述

分析了湿法磷酸料浆的腐蚀特点,讨论了湿法磷酸工业用不锈钢的选择与应用要求,对当今湿法磷酸工业用不锈钢的特点、应用和发展做了点评.介绍并评定了湿法磷酸工业用主要不锈钢的化学成份、力学性能、耐腐蚀性能和工艺性能,为磷酸设计、设备制造和磷酸生产提供了有意义的参考数据.