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Search Results: 1 - 10 of 208878 matches for " 陈一梅 "
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感潮河段整治工程对河床冲淤影响预测
,黄永葛
海洋工程 , 2002,
Abstract: 闽江竹岐至侯官河段属山溪性感潮河段,水文条件变化快变幅大,河床边界复杂,整治建筑物多。通过选择有关参数,处理工程边界以及进口边界条件,用二维河道全沙数学模型计算所得的河床变形趋势与实测情况基本一致。在此基础上,对竹岐至侯官河段工程后的河床冲淤变化以及整治工程效果进行了预测分析
吸水链霉菌NND-52-C基因工程宿主载体系统的构建*
江曙,代杰,,黄为
微生物学通报 , 2004,
Abstract: 吸水链霉菌NND-52-C菌株是大环内酯类抗生素 阿扎霉素B的高产菌株。采用原生质体转化技术 ,将来自变铅青链霉菌TK2 4菌株的pIJ70 2质粒转化吸水链霉菌NND-52-C菌株的原生质体 ,建立了吸水链霉菌NND-52-C菌株的基因工程宿主载体系统。确定了NND-52-C菌株原生质体制备和再生的条件 ,其原生质体形成率达到 108个 mL ,再生率约为0.2 % ,转化率为102~103个转化子 μg质粒DNA。
聚丙烯酰胺凝胶电泳对几个苏芸金杆菌变种营养细胞酯酶图型的分析
张用,,宗胜
微生物学通报 , 1979,
Abstract: Norris曾提出用淀粉凝胶电泳分析营养细胞酯酶类型作为苏芸金芽孢杆菌(Bacillusthuringiensis,简称B.t)分类鉴定的方法之一。并将B.t.血清型1—9中的12个变种定为10个酯酶型。他的这一方法后来为大家所承
环境因子对胶州湾移植底播菲律宾蛤仔滤水率的影响
,,徐宾铎
南方水产科学 , 2007,
Abstract: 在实验室条件下对胶州湾移植底播菲律宾蛤仔的滤水率进行了研究。结果表明,不同温度、盐度、ph值条件下的蛤仔滤水率差异显著;2、3龄蛤仔滤水率随环境因子的变化趋势呈极显著正相关。在设定的环境因子梯度下,蛤仔滤水率随着温度、盐度、ph值的升高呈现先增大、后减小的趋势。最大滤水率分别出现在温度23℃、盐度30、ph值8.2。
甲强龙、电针联合羊膜上皮细胞移植对脊髓损伤大鼠轴浆运输功能及GFAP表达的影响
, , 薛辉, 刘佳
吉林大学学报(医学版) , 2010,
Abstract: 目的:探讨甲强龙(MP)、电针与羊膜上皮细胞(AECs)联合治疗对脊髓损伤(SCI)大鼠轴浆运输功能的影响,为临床治疗脊髓损伤寻找一种更为有效的方法。方法:将60只成年雌性Wistar大鼠随机分成5组,每组12只。脊髓损伤对照组:做脊髓损伤模型,不进行治疗;甲强龙组:脊髓损伤后,用大量甲强龙药物冲击治疗,共3d;甲强龙+电针组:在甲强龙治疗基础上,脊髓损伤后4h,行华佗夹脊穴电针治疗;甲强龙+电针+AECs组:在甲强龙+电针组基础上,脊髓损伤后第7天,在脊髓损伤处移植大鼠AECs联合治疗;假手术组:只打开椎板,暴露脊髓,不造成脊髓损伤。各组每隔6 d进行行为学观察(BBB评分),术后30d行荧光红(FR)顺行示踪和GFAP免疫荧光组织化学观察。结果:BBB评分显示,脊髓损伤后经过治疗各组都有不同程度的后肢功能恢复,其中以甲强龙+电针+AECs组恢复最为明显,第30天,BBB评分可恢复到15.23±1.01。荧光红(FR)顺行示踪,甲强龙+电针+AECs组可见大量有序的FR阳性神经纤维,神经示踪剂能被运输到脊髓损伤区远侧端较远的距离;100倍荧光显微镜下观察,损伤区FR阳性神经纤维数为312.67±34.06,与其他治疗组比较差异有显著性(P<0.01);GFAP表达结果,各组GFAP阳性细胞较假手术组均明显增高,而甲强龙+电针+AECs组的表达量低于其他损伤组,200倍荧光显微镜下观察,损伤区GFAP阳性细胞数为633.61±54.4,与其他治疗组比较差异有显著性(P<0.01)。结论:甲强龙、电针与AECs联合治疗脊髓损伤能够有效地抑制星形胶质细胞的过度增生,恢复脊髓轴浆运输功能,促进神经纤维再生。
1994年华南暴雨期间夏季风的特征及其对水汽的输送
,成新喜?,,陆汉城?
热带气象学报 , 1998,
Abstract: 用拉格朗日方法计算等熵面上空气质点和物质线的轨迹。分析指出1994年华南暴雨和夏季风异常有密切的关系,特别是东亚热带季风更是起着决定性的作用;用这种方法可以追踪水汽的源地及演变过程,分析气流对水汽的输送作用。
绿色复合材料的研究进展
曹勇 ,合田公 ,
材料研究学报 , 2007,
Abstract: ?天然植物纤维具有价廉质轻、比强度高和自然降解等优良特性,其与生物降解树脂进行复合,能开发出环境友好、可自然降解的绿色复合材料.本文评述了该领域的研究进展,重点是竹纤维、各种麻纤维以及甘蔗渣纤维等天然纤维与不同的生物降解树脂的绿色复合材料的制备,不同成型方法的探讨,材料各种力学性能的分析比较,以及为了增强材料的力学性能而进行的纤维改性,并展望了绿色复合材料的未来的研究趋势.
虚拟同步发电机技术及展望
郑天文,来军,,生伟
电力系统自动化 , 2015, DOI: 10.7500/AEPS20150508006
Abstract: 随着分布式电源渗透率增加,电网将逐步发展为电力电子变换器为主导的低惯量、欠阻尼网络,稳定性问题愈发严重。虚拟同步发电机(VSG)技术因其能使逆变器模拟同步发电机运行机制、有利于改善系统稳定性而成为研究热点,并具有广泛的应用前景。首先介绍了VSG的基本原理,然后从运行控制、稳定分析以及典型应用等方面分别综述了VSG技术的关键问题与研究现状,并从中提炼出后续可能的研究方向。
富血小板纤维蛋白超微结构观察及意义
铁楼,,张新海,,黄传,王晓熙
- , 2018, DOI: 10.16118/j.1008-0392.2018.04.009
Abstract: 目的 探讨富血小板纤维蛋白(platelet rich fibrin, PRF)形态学超微结构及意义。方法 选择10例健康志愿者,抽取静脉血制备PRF,对PRF分别行光学显微镜、扫描电子显微镜(scanning electron microscope, SEM)和透射电子显微镜(transmission electron microscope, TEM)观察。结果 PRF为淡黄色纤维蛋白凝胶,H-E染色见胶原纤维为染色均一的淡红色网状结构,在近细胞端纤维排列较致密,含大量血小板。吉姆萨染色见淡蓝色的胶原纤维为网状结构,近细胞端见染为蓝色的白细胞。SEM发现胶原纤维排列成疏松多孔网状支架结构,含大量静止或伸出伪足的血小板及白细胞。TEM发现血小板处于静止或激活状态,α-颗粒释放于细胞和纤维之间,在细胞之间见高密度区为血小板释放的颗粒。结论 PRF胶原纤维的网状立体结构和富含血小板激活释放生长因子,对生物学作用发挥有重要意义。
Objective To investigate the morphological ultrastructure of platelet rich fibrin(PRF)and its implication. Methods PRF was prepared from venous blood samples from 10 healthy donors. The PRF was observed by light microscopy (H-E staining and Wright Giemsa staining), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), respectively. Results PRF presented as light yellow fibrin gel. HE staining showed that collagen fiber was of uniform and light red network structure. In the near cell end, the fibers were denser and contained lots of platelets. Giemsa staining showed that the collagen fibers were of light blue mesh structure, and the dark blue white blood cells were in the near cell end. SEM observation found that collagen fibers were arranged in a porous reticular scaffold, containing a large number of static or protruding platelets and leukocytes. TEM showed that platelets were at rest or activated, α-particles were released between platelets or fibers, which displayed a high density area between cells. Conclusion Through the reticular stereoscopic structure of collagen fibers and rich platelets activating growth factor release, PRF plays an important biological role
基于一致性的并联虚拟同步发电机分布式协同控制
Consensus-based distributed control for parallel-connected virtual synchronous generator

来军,王余阳,郑天文,,生伟
控制理论与应用 , 2017, DOI: 10.7641/CTA.2017.60031
Abstract: 虚拟同步发电机(virtual synchronous generator, VSG)可模拟同步发电机运行机制, 并为系统提供惯性和阻 尼支撑. 在孤岛模式下, VSG并联运行多采用分散下垂控制, 不具备频率恢复以及有功出力合理分配等功能, 为此, 本文提出了一种基于一致性的并联VSG分布式控制方法, 可改善系统频率与有功功率特性. 本文首先介绍了传统 VSG控制的数学模型, 并在此基础上设计了VSG并联系统频率恢复及有功出力合理分配的整体方案. 在分布式控制 模式下, 相邻VSG只需少量信息交互即可控制频率恢复到额定值, 并可实现功率的按需分配, 满足了不同用户的定 制需求. 仿真结果验证了所提方法的正确性和有效性.
Virtual synchronous generator (VSG) can mimic the operating mechanism of the synchronous generator, which can provide inertia and damping support for system. In islanded mode, parallel-connected VSGs mainly use decentralized droop control and the system is not able to restore frequency or reasonably share active power. To solve these problems, a distributed control strategy of parallel-connected VSGs based on consensus algorithm is proposed. The control strategy can improve the frequency and active power characteristics of the system. The mathematic model of traditional VSG control is firstly demonstrated. Based on that, the whole control scheme of frequency restoration and active power sharing for parallel-connected VSGs is established. With distributed control strategy, the scheme utilizes distributed communication network exchanging few information between neighbor VSGs to make the system restore frequency to nominal value and reasonably share active power to satisfy different demand. Simulation results verify the validity and effectiveness of the proposed control strategy.
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