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Search Results: 1 - 10 of 50468 matches for " 雷梅 "
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经济转型语境下中国道路的世界意义


- , 2016,
Abstract: 摘要 中国道路,即中国特色社会主义道路不仅仅是一个国家意义上的道路,也是构成整个人类社会追求探索发展道路的一个重要内容。改革开放以来中国成为世界经济转型中的一个重要因素,中国道路以自身经济崛起推动了国际政治经济秩序的调整与改变;中国道路以改革与发展的途径、成就重塑了社会主义的世界形象;中国道路以独具中国特色的现代化道路推动世界现代化进程,扩展与丰富了现代化的内涵。
一种载波频率未知的扩频序列盲估计算法
Blind Estimation of M-Sequence in CDMA Signal without the Information of Carry Frequency
 [PDF]

颜海,, 王泽辉, 盛迪
Hans Journal of Wireless Communications (HJWC) , 2013, DOI: 10.12677/HJWC.2013.31004
Abstract: 提出一种载波频率未知情况下,利用主分量分析法盲估计直接扩频序列的算法。算法把接收到的信号投影到扩频码所在向量域,通过搜索投影向量的特征值,可以在没有载波频率、信道先验信息的情况下,估计得到扩频序列和载波频率。理论和仿真结果表明了算法的有效性。
This paper propose a new method to blind estimation m-sequence in DS-CDMA signals without the informa- tion of carry frequency. A new model was built and the m-sequence can be blindly estimated by PCA in this model. The carry frequency can also be got. Analytical and simulated results show that the proposed method has a good perfor- mance.
复合生物反应器对甲醛废气净化性能最大化研究
The Research on Performance Maximization of Purifying Formaldehyde Emission by Composite Bioreactor
 [PDF]

, 王洁, 孙珮石
Hans Journal of Chemical Engineering and Technology (HJCET) , 2015, DOI: 10.12677/HJCET.2015.54014
Abstract:
本文采用复合生物反应器对甲醛废气的净化性能进行了实验研究,考察了进口气体浓度和气体流量的改变对甲醛净化性能的影响。结果表明:当pH值控制在6~8、气体流量为400 L/h、循环液流量为10 L/h、甲醛进口气体浓度为300 mg/m3时,复合生物反应器对甲醛废气有最大净化性能,其最大生化去除量可达到13.70 mg/(L?h)。
In this paper, the performance of purifying formaldehyde emission by composite bioreactor was investigated experimentally. The effects of changes in import gas concentration and gas flow rate on formaldehyde purification performance were examined. The experimental results indicated that when the pH was controlled at 6 - 8, the gas flow rate was 400 L/h, the circulating fluid flow rate was 10 L/h, and the concentration of formaldehyde imported gas was about 300 mg/m3, compound bioreactor was biggest for purification performance of formaldehyde emission. The maximum amount of biochemical removal can reach 13.70 mg/(L?h).
利伐沙班预防人工膝关节表面置换术、人工全髋关节置换术后下肢深静脉血栓的疗效观察
,张玉
第三军医大学学报 , 2011,
Abstract:
Heavy metal concentrations in soils and plants around Shizhuyuan mining area of Hu′nan Province
湖南柿竹园矿区土壤重金属含量及植物吸收特征

LEI Mei,

生态学报 , 2005,
Abstract: Land contaminated by high levels of heavy metals in mining area is urgent to be remidiated. To find out the tolerant plants, which can adapt to the local climate and the soil conditions, is the premise of vegetation reconstruction. Field survey was carried out in the Shizhuyuan mining area of Hunan Province, which is the national largest nonferrous mine in China. Fifteen soil samples and 72 samples of 48 plants were collected during the field surveys at 5 contaminated sites, including the Caishan Smelter, the Caishan Tailing Pond, the Muchang New Tailing Pond, the Muchang Old Tailing Pond and the Bailutang Tailing Pond. The concentrations of heavy metals in soils and plants, including As, Cu, Cd, Pb, and Zn, were analyzed. The results showed that the soil pollution in the metal smelter was more severe than that in the tailing area. The concentrations of As, Cd, Pb and Zn in all the soil samples collected from smelter sites were dramatically higher than the national soil limitation values for the plant growth (30 mg/kg, 1 mg/kg, 400 mg/kg, 500 mg/kg and 500 mg/kg). The highest concentrations in the soil samples of the smelter sites were 11,299 mg/kg, 236 mg/kg, 29,702 mg/kg and 24,333 (mg/kg,) respectively. Same as the smelter sites, the soil samples taken from all of the tailing ponds contained high concentrations of As, Cd, Cu, Pb and Zn as well. The diversity of the plant species might be influenced by the heavy metal existence in the soils. Owing to the high level of the heavy metal content in the soil of the metal smelter, less species of plants were found in this area than the plants in the tailing ponds. There were totally 48 species among 16 families recorded in the metal smelter and the tailing ponds, of which 13 species botanically belonged to the Compositae, and were the dominant components of the tailings flora. Eight species belonged to Pteridaceae were naturally colonizing this area. The uptake of heavy metals by the plants can be classified into three types according to the metal concentrations in the plant shoots and roots: the accumulator, eg. Pteris vittata L. and Boehmeria nivea (L.) Gaud., which absorbed a large amount of heavy metals by the roots and transported to shoot; the root compartment, eg. Patrinia villosa and Equisetum hiemale, which also absorbed a large amount of heavy metals but mainly held in the roots; and the excluder, eg. Selaginella davidii Franch and Miscanthus sinensis Andlerss, which absorbed less heavy metals than the accumulators.
说明文阅读中因果序列的表征
伍丽,
心理学报 , 2012,
Abstract: 结合自定步调阅读与句子启动再认范式, 探讨说明文阅读过程中因果序列的表征问题。研究包括3个实验, 实验1的文本提供一个包括4个概念的因果链(如, A-B-C-D), 文本最后设置包含概念A或概念B或概念C的句子, 对概念D进行探测, 结果发现, 对于概念D的再认启动作用, 概念C>概念B>概念A; 实验2改变因果链的说明顺序, 使之与因果链本身次序不一致, 结果与实验1一致; 实验3的文本分别介绍两条独立的因果链(如A-B-C; D-E-F), 最后呈现包含概念A或概念D的句子, 对概念C进行探测, 结果发现, 包含概念A的句子理解启动了相关因果链, 使读者对随后呈现的概念C的再认反应加快。基于本研究结果, 结合相关研究, 本文尝试提出说明文文本表征的建构模式。
The Directions of Separation and Integration in the Research of Situation Models
情境模型研究中的分离与整合

伍丽,
心理科学进展 , 2009,
Abstract: 情境模型概念出现后,有关情境模型研究重点解决以下两大问题:其一,情境模型不是课文基础表征;其二,情境模型具有多维结构。前者表现为情境模型与课文基础表征的分离研究,后者表现为情境模型从单维向多维的整合研究。在此基础上,研究者进一步统合情境模型研究,初步考察情境模型的实质问题。基于情境模型研究的分离与整合的趋势,情境模型的未来研究将进一步发展研究范式,深入探讨“情境模型是什么”与“情境模型的加工机制是怎么样”等问题。
“重金属污染土地修复暨863重点项目进展研讨会”召开
李晓燕,
地理研究 , 2008,
Abstract: 土地污染是我国目前面临的重大资源和环境问题。为交流重金属污染土地修复和矿山土地复垦的研究进展,“重金属污染土地修复暨863重点项目进展研讨会”于2008年5月9~10日在北京中国科学院地理科学与资源研究所举行。会议由中科院地理资源所环境修复中心、地表环境化学过程与健康
高性能热塑性树脂基复合材料复合方法及成型工艺简介
包筱,
复合材料学报 , 1989,
Abstract: 芳香族聚合物一类新型热塑性工程塑料的出现,有可能代替某些热固性树脂基体制作长纤维增强复合材料。国外对热塑性工程塑料树脂基复合材料进行了大量的研究,已经成功地应用于航空航天事业。保证这种材料取代某些热固性树脂基复合材料的前提是预浸带制造方法和成型工艺技术的实施。本文将对热塑性树脂基复合材料的预浸带制备及成型方法作一简单分析介绍。
中国居民间接生活能源消费的结构分解分析
李艳,
资源科学 , 2008,
Abstract: 居民生活能源消费可分为直接和间接消费两部分,一般来说,后者远远大于前者。因此,在经济快速发展,能源消费迅猛增长的背景下,分析居民间接生活能源消费的变动趋势及原因,对于寻找节能途径与对策具有重要意义。本文以1987年~2002年为样本期,运用投入产出方法,构建结构分解分析模型,对中国居民间接生活能源消费的增长原因进行了实证分析。结果表明:促使间接生活能源消费增加的因素有居民消费总量增加、消费结构变化、城乡消费比例变化和中间生产技术变化,而起到抑制能源消费增加的因素唯有以直接能源消耗系数大幅下降为标志的节能技术进步。可见,由于我国正值工业化和城市化的中期阶段,居民消费变化和产业结构演进都成为能源消费上升的重要拉动因素,因此必须提倡适度合理的消费方式,促进生活节能;同时加快调整以重化工业为主导的产业结构,发挥结构节能效应。
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