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Search Results: 1 - 10 of 38607 matches for " 罗晶 "
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传播学视域下的微博营销

湖南工业大学学报(社会科学版) , 2013,
Abstract: 微博营销以微博作为营销平台,利用自己的微博更新向网友传播企业、产品的信息,树立良好的企业形象和产品形象。虽然微博营销具有便捷性、低门槛、传播力广等特点,但也不能忽略微博营销的劣势。在海量信息里,如何精准传播,扩大产品传播的深度和广度需要有精心的策划。在运行过程中,微博营销需要注意的技巧以及需要规避的问题。
玉米醇溶蛋白的磷酸化修饰及结构研究

- , 2015, DOI: 10.13982/j.mfst.1673-9078.2015.8.016
Abstract: 玉米醇溶蛋白广泛应用于食品、医药、生物材料、纺织工业等领域,但蛋白不溶于水的性质限制了其应用范围。为改善其性质,本文用磷酸化修饰玉米醇溶蛋白,测定磷酸化修饰前后玉米醇溶蛋白的黏度、等电点、酸、碱稳定性等物理性质;用圆二色谱研究磷酸化修饰前后蛋白的二级结构和三级结构变化,用示差扫描量热法(DSC)测定蛋白的热稳定性。结果表明:Zein蛋白在80%乙醇溶液中的等电点(PdI)为pH 5.97,粒径为1436 nm。经磷酸化修饰后,蛋白与磷酸盐以O-磷酸键和N-磷酸键结合,酸性条件(pH 5.0)主要以O-磷酸键结合为主,中性及碱性(pH 7.0和9.0)条件下主要以N-磷酸键结合。同时,蛋白的黏度增加,等电点酸性漂移,α-螺旋结构含量降低,玻璃态转化温度升高。
Zein has widespread applications in food, medicine, biological materials, and the textile industry, but its use is limited to some degree due to the insolubility in water. To overcome this drawback, zein was phosphorylated by POCl3 and its physical properties of modified zein, such as viscosity, isoelectric point, as well as stability in acid and alkali were determined. Secondary and tertiary structures of zein before and after phosphorylation were measured by circular dichroism (CD), while thermal stability was determined using differential scanning calorimetry (DSC). The results showed that in 80% ethanol solution, the isoelectric point (PdI) of zein was at pH 5.97 and particle size was 1436 nm. Post modification, phosphate was combined with zein by O- and N- phosphate bonds, which mainly formed O-phosphate bonds under acidic conditions (pH 5.0) and N-phosphate bonds under neutral and alkaline conditions (pH 7.0 and 9.0). In addition, the viscosity of modified zein increased, the isoelectric point showed acidic shift, α-helix structure content reduced, and glass transition temperature increased.
第九届国际比较内分泌学术会议在香港召开

海洋科学 , 1982,
Abstract:
第九届国际比较内分泌学术会议在香港召开

海洋科学 , 1982,
Abstract:
中国科学院微生物研究所菌物标本馆馆藏菌寄生属Hypomyces标本的分类研究
,庄文颖
菌物学报 , 2012,
Abstract: 对中国科学院微生物研究所菌物标本馆保存的菌寄生属标本进行了分类学方面的清理和订正,鉴定出9个种,其中大孢菌寄生H.marcrosporus、丝层菌寄生H.subiculosus和侧毛斑菌寄生H.tegillum为中国新记录种。
岩石损伤统计本构模型研究
Study on the Rock Statistical Damage Constitutive Model
 [PDF]

汤连生, 桑海涛,, 珍贵, 陈浩昆
International Journal of Mechanics Research (IJM) , 2014, DOI: 10.12677/IJM.2014.33003
Abstract:
从岩石微裂隙等缺陷及随机分布的特点出发,建立岩石损伤统计本构模型,其核心在于科学地选取反映损伤程度的岩石微元强度度量方法、岩石内部损伤随机分布的形式以及模型参数。首先基于Lemaitre应变等价性假说建立了三维应力作用下岩石损伤本构方程,讨论了常用的M-C等3个岩石强度准则和Weibull分布等5个岩石微元强度概率模型。然后基于H-B强度准则和幂函数分布建立了岩石的损伤统计本构模型,并给出了相关参数的确定方法,借助引用的实例验证了本文所建模型和参数确定方法的有效性,最后建议了下一步研究的重点方向。
To establish a rock statistical damage constitutive model taking the defects such as the rock mi-cro-cracks and the characteristics of their random distribution into account, the vital steps are to select a method scientifically to measure the rock micro-strength, which is capable of reflecting its damage conditions; as well as the pattern of randomly distributed damage in rock and the deter-mination of the model parameters. Firstly, a damage constitutive equation for rock under three dimensional stress conditions is established, in terms of the Lemaitre’s hypothesis of strain equi-valence; then discussions are presented in detail to address the frequently employed rock strength criterions such as M-C strength criterion and the rock micro-element strength probability models such as Weibull probability distribution. Based on the H-B criteria and the power function distribution, a statistical damage constitutive model for rock is proposed, and the method of de-termination for the relative model parameters is suggested; Furthermore, a case study is intro-duced to testify the validity of the constitutive model and the method to obtain the parameters which are proposed in this paper; at last, suggestions on the further research and its method are addressed.
COI基因作为丛赤壳科真菌DNA条形码的测试
赵鹏,,庄文颖
菌物学报 , 2012,
Abstract: 以丛赤壳科33种76个菌株为材料,探讨COI基因作为该科DNA条形码的可能性。结果表明,该DNA片段存在较多内含子,为了获取某些种的短片段,需设计许多引物,PCR扩增与测序成功率低,难以达到便捷、快速的物种鉴定的目的。因此,COI不宜作为丛赤壳科的DNA条形码。对已获得的少数片段进行分析表明,该基因对丛赤壳科部分种具有较强的物种鉴别力。
基于uh模型的土体变形局部化分析
,姚仰平*,
岩石工程学报 , 2015,
Abstract: 应变局部化现象广泛地存在于超固结土和砂土的室内及现场试验中。当土体发生破坏时,土体变形往往集中在狭窄的带状区域,并且破坏面上的强度并非同时发挥。超固结度、围压、摩擦角、温度及加载应变率等因素的改变均可以使土体强度提高,但上述部分因素在提高土体强度的同时却可能对土体的稳定性产生不利影响,导致土体更易发生局部化破坏。因而基于uh模型(统一硬化模型),采用平面应变下的分叉理论解对土体局部化问题进行分叉分析,探究了超固结度、围压、临界状态应力比、温度及加载应变率对分叉应变影响,并对所得结果进行分析讨论。此外,通过有限差分方法在平面应变条件下对局部化现象进行数值模拟,上述影响因素的分析结果与理论解相一致。
贮氢合金燃烧剂与固体推进剂常用含能组分的相容性研究
,运军
兵工学报 , 2008,
Abstract: ?贮氢合金是一种能在晶体的空隙中大量贮存氢原子的功能材料,可以制成一种新型燃烧剂以作为固体推进剂的重要组分。利用差示扫描量热(DSC)法研究了贮氢合金燃烧剂与固体推进剂常用含能组分高氯酸铵(AP)、黑索今(RDX)、六硝基六氮杂异伍兹烷(CL-20)、1/1-NG/DEGDN、硝化棉(NC)的相容性。结果表明,贮氢合金燃烧剂与这些含能组分均相容。
穿山龙多糖的提取与纯化工艺条件优化
王昭,巅辉
华侨大学学报(自然科学版) , 2007, DOI: 10.3969/j.issn.1000-5013.2007.03.019
Abstract: 通过单因素法,研究从穿山龙中提取水溶性多糖的工艺条件,以及分析原料质量与提取液体积的比(料液比)、浸提温度和提取时间3个主要因素对提取量的影响,并对热水浸提穿山龙多糖的工艺条件进行优化.实验表明,水提多糖最佳提取工艺条件:料液比(g∶mL)为1∶4,浸提温度为90℃,浸提时间为2.5h.按最佳工艺条件水煮提,醇沉干燥得到粗多糖(CP),经柱层析分离纯化后,可得组分CP-Ⅰ,CP-Ⅱ.采用柱层析、纸电泳检测组分的纯度,并利用高效液相色谱法和纸层析法分析组成,结果表明,CP-Ⅱ为单一多糖,由鼠李糖(Rha)、果糖(Fru)和葡萄糖(Glu)3种单糖组成,其量比n(Rha)∶n(Fru)∶n(Glu)为1∶1.08∶48.6.
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