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Search Results: 1 - 10 of 256406 matches for " 李秋芬 "
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虾池环境生物修复作用菌生长影响因子的研究

水产学报 , 2001,
Abstract: 采用吖啶橙荧光染色计数法和吸光度法,测定了不同温度、盐度、初始ph、溶解氧、接种量及不同培养基配方对虾池环境生物修复作用菌生长的影响.结果表明,大部分作用菌在16~40℃、盐度0~40、ph6.6~9.0的范围内有氧或微氧条件下均可生长,能适应一般虾池的环境条件,培养基中磷酸盐是必不可少的.在28~34℃、盐度20~30、ph7.4~8.2的有氧条件下生长最好,可作为大规模生产时的培养条件.为增加菌体产量和活力,可适当增加接种量,提高蛋白胨和酵母膏的浓度至2216e配方浓度的五倍,培养时间以18~20h为宜.
复合有益菌剂对工厂化大菱鲆育苗水净化效果研究

水产学报 , 2006, DOI: 10.3724/SP.J.00001
Abstract: 无
对立违抗障碍生物学研究进展
Oppositional Defiant Disorder to Biological Research
 [PDF]

王长虹,, 刘蒙, 王东平, , 杨俊
International Journal of Psychiatry and Neurology (IJPN) , 2012, DOI: 10.12677/IJPN.2012.14009
Abstract:

本文从流行病学特征、母孕期和围生期的不利因素、遗传学研究三方面概述了对立违抗障碍的生物学因素研究进展,并认为其发生发展与遗传因素密切相关,通过基因研究可以提供其易感基因,从而从生物学角度为疾病的预防和治疗提供帮助。
This article provided an overview of Oppositional Defiant Disorder research progress of biological factors, from the epidemiological characteristics, the adverse factors during the pregnancy and prenatal period, and genetic research these three aspects, and believed that its development was closely related to genetic factors. Through genetic research could provide its susceptibility gene, which provided help for the prevention and treatment of diseases from a biological perspective.

气液固相催化合成甲醇本征动力学
,,廖晖
化工学报 , 1995,
Abstract: 研究了以液体石蜡为液相介质在铜基催化剂上由CO、CO_2与氢气合成甲醇的本征动力学,按CO和CO_2加氢生成甲醇的反应途径,提出了反应机理,建立了6种动力学模型,经参数估值及模型筛选,得出了最终模型,该模型的计算值与实验值吻合很好,对CO及CO_2转化速率的平均偏差分别为3.69%和3.92%。
生脉注射液对老年人血压的影响
董延,
中国中医药信息杂志 , 2005,
Abstract:
电针配合西药治疗抑郁症52例
,董延
中国中医药信息杂志 , 2005,
Abstract:
电针配合西药治疗抑郁症严重失眠患者26例
,董延
中国中医药信息杂志 , 2005,
Abstract:
异养硝化–好氧反硝化细菌X3的氮形态响应
Response to Different Nitrogen Forms of Heterotrophic Nitrifying-Aerobic Denitrifying Bacteria X3
 [PDF]

张艳, 成钰, 费聿涛,
Adances in Marine Sciences (AMS) , 2016, DOI: 10.12677/AMS.2016.34016
Abstract:
异养硝化–好氧反硝化细菌的氮响应机制对研究生物脱氮技术具有重要意义。通过分析异养硝化–好氧反硝化细菌X3 (Halomonas alkaliphila)生化周期与培养液中氮形态的关系,对该菌的脱氮机制进行了研究。结果表明:1) 含混合形态氮培养液中,细菌X3在对数生长期主要进行有机氮的降解;整个周期中,氨氮先升高后降低,48 h达到最高值,亚硝酸氮先升高后降低,第4天达到最高值,硝酸氮表现为先下降,48 h后上升的变化趋势,96 h总氮去除率为17.07%;2) 仅含无机氮的培养液中,细菌X3在对数生长期主要进行氨氮和硝酸氮的降解;整个周期中,氨氮和硝酸氮持续下降,亚硝酸氮先升高后降低,24 h达到最高值,96 h总氮去除率可达51.13%。结论:细菌X3的氮降解优先顺序和最终效能皆受控于环境氮化合物形态。本研究有望为生物脱氮工程设计提供理论指导。
For the development of biological denitrification technique, study on the response mechanism of heterotrophic nitrifying-aerobic denitrifying bacteria to nitrogen forms has great significance. Herein the relationship between the nitrogen form and the denitrification activity of Halomonas alkaliphila X3 was studied by monitoring the change of different nitrogen forms in the culture so-lution, and the results are as follows. 1) In the culture solution containing both organic nitrogen and inorganic nitrogen, Halomonas alkaliphila X3 mainly degrades organic nitrogen during the logarithmic growth period. Over the whole culture cycle, the concentration of ammonia nitrogen rises up in the first 48 h, followed by a decreasing trend; the concentration of nitrite nitrogen rises up in the first 4 d, followed by a decreasing trend; while the concentration of nitrate nitrogen de-creases in the first 48 h, followed by a decreasing trend. In total 17.07% nitrogen is removed from the culture solution after a treatment for 96 h. 2) In the culture solution containing only inorganic nitrogen, the bacteria mainly degrades ammonia nitrogen during the logarithmic growth period. Over the whole culture cycle, the concentration of ammonia and nitrate nitrogen keeps down; the concentration of nitrite nitrogen rises up in the first 24 h, followed by a decreasing trend. In total 51.13% nitrogen is removed from the culture solution after a treatment for 96 h. In conclusion, the priority and efficiency of the nitrogen degradation by Halomonas alkaliphila X
油气两相动压密封端面结构多参数正交优化及试验研究
,双喜,,蔡纪宁,,王磊
- , 2017, DOI: 10.13543/j.bhxbzr.2017.01.014
Abstract: 针对油滴均匀分布在气相中的油气两相动压密封,利用Fluent软件建立两相动压密封端面间流体模型,并采用多参数正交优化法,分析密封性能参数(工作膜厚、流体膜刚度、泄漏量及摩擦扭矩)随两相密封动压槽结构参数(螺旋角、槽深、槽宽比、槽坝比和槽数)的变化。分析结果表明:在恒定转速、压差和闭合力条件下,通过调整各结构参数均可获得最大工作膜厚;流体膜刚度随着螺旋角和槽深的增大而减小;气体泄漏率和液体泄漏率随密封槽结构参数变化规律相同,且变化规律与工作膜厚相同;得到了定工况下的最优动压槽结构参数。最后通过自主设计的气液两相动压密封实验装置进行静压试验和运转试验,验证了动压密封在油气两相介质工况下应用的可行性。
Abstract:A complete and accurate two-phase hydrodynamic fluid film seal finite element model for a two-phase oil and gas dynamic pressure seal, in which oil droplets are evenly distributed in the gas, has been established by Fluent. The changes in sealing performance parameters (including film thickness of work, film stiffness, leakage, and friction torque) as a function of the dynamic pressure groove structure parameters (including spiral angle, groove depth, groove-width ratio, groove-bar ratio, and groove number) of the two-phase seal were analyzed using the orthogonal multi-parameter optimization method. The results show that the maximum film thickness of work can be obtained by adjusting the spiral angle, groove depth, groove-bar ratio or groove number under conditions of constant speed, pressure and closing force. Increasing the spiral angle and groove depth results in decreasing film thickness. The change in the leakage of gas as a function of groove structure parameters is the same as that for the liquid, and the behavior of the two phases as a function of varying film thickness of work is similar. The optimal dynamic pressure groove structure parameters were obtained under given conditions. The feasibility of employing the dynamic pressure seal in oil and gas two-phase medium conditions was verified by means of a self-designed dynamic pressure seal experimental device, for which static-pressure tests and running tests were carried out. A theoretical basis for the fabrication of a two-phase oil and gas dynamic pressure seal was obtained by means of this study.
二维镉配位聚合物[cd(nip)(bix)0.5h2o]n构筑的新型(3,5,5)连接的三维氢键超分子体系(英文)
胡宗智?,赵 君?,柯希俊?,, 彩?,东升?
无机化学学报 , 2011,
Abstract: 在水热条件下合成了一个新颖的配位聚合物[cd(nip)(bix)0.5h2o]n(1)(nip=5-硝基间苯二甲酸,bix=1,4-(二亚甲基)二咪唑)。单晶x-射线衍射分析表明,晶体属三斜晶系,p1空间群,晶胞参数a=0.8271(2)nm,b=1.0165(3)nm,c=1.1474(3)nm,α=70.862(4)°,β=68.988(4)°,γ=69.001(4)°。v=0.8184(4)nm3,z=2,dc=1.861g·cm-3,μ=1.380mm-1,f(000)=454,最终的r1=0.0400,wr2=0.0901。配合物1中,nip2-离子以μ3桥联的方式连接cd(ⅱ)中心形成含有交替8元环和16元环的一维聚合链,进而,bix配体柱撑一维链形成了(3,4)-连接的二维配位网;最后,通过r22(6)氢键环的作用,二维网拓展为具有(3,5,5)-连接{3.4.5}{3.42.5.64.7.8}{3.43.52.62.72}拓扑结构的三维超分子体系。此外,本文还研究了配合物1的热稳定性和荧光性质。
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