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Search Results: 1 - 10 of 249071 matches for " 李倩倩 "
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M/G比对海藻酸钠溶胶流变学性质的影响
倩倩
- , 2016, DOI: 10.13982/j.mfst.1673-9078.2016.4.019
Abstract: 采用动态流变仪研究了M/G比(甘露糖醛酸/古洛糖醛酸)对海藻酸钠(AGNa)溶胶的静态和动态流变学性质的影响,并探讨M/G比对其胶凝性质和凝胶的应力松弛等性质的影响。研究表明:M/G比对中等黏度范围AGNa的静态流变学特性影响显著;而对低黏度范围AGNa的静态流变学特性影响不显著。在低pH时,AGNa表现出假塑性流体的流动特性,而在高pH时,则表现为近似牛顿流体的特性。温度对AGNa溶液表观黏度的影响符合Arrhenius模型,其流动活化能与AGNa的M/G比呈正相关。在同一黏度范围内,随着M/G比的升高,AGNa溶液的胶凝时间(tG)逐渐延长,胶凝温度(TG)逐渐下降,同时,AGNa凝胶的应力及应力松弛模量也呈下降趋势。M成分含量高的,有利于AGNa形成以黏性成分为主的流体体系,而G成分含量高的,有利于AGNa形成以弹性成分为主的凝胶体系。
The effect of varying mannuronic acid/guluronic acid static (M/G) ratios on the static and dynamic rheological, gelling, and gel stress-relaxation properties of sodium alginate (AGNa) was studied using a dynamic rheometer. The results showed that the M/G ratio significantly influenced the static rheological properties of AGNa within the medium viscosity range, but the effect was not significant within the low viscosity range. AGNa exhibited the flow characteristics of pseudoplastic fluid at low pH and Newton fluid at high pH. The effect of temperature on the apparent viscosity of AGNa solution was in accordance with the Arrhenius model and flow activation energy positively correlated with the M/G ratio. Within the same viscosity range, an increase in M/G ratio was accompanied by prolongation of AGNa gelation time (tG), decrease in gelation temperature, and a downward trend in stress and stress-relaxation modulus of AGNa gel. A high M proportion favored formation of a viscous component-based fluid system, while high G proportion benefited the formation of elastic component-based gel system.
输电线路复合绝缘子的电气及机械特性
Electrical and Mechanical Performance of Transmission Line Composite Insulator
 [PDF]

崔竹叶, 倩倩, 王少华
Advances in Energy and Power Engineering (AEPE) , 2016, DOI: 10.12677/AEPE.2016.42004
Abstract:
以挂网运行线路110 kV、220 kV复合绝缘子为研究对象,对其电气、机械性能进行了试验检测;在此基础上对复合绝缘子的运行状态进行了有效评估。结果表明,运行多年的复合绝缘子,其电气和机械综合性能仍基本满足线路运行要求,老化特征与其运行时间之间存在一定的相关性。试验研究结果可为复合绝缘子的运行和维护工作提供参考。
Taking 110 kV and 220 kV operation line composite insulators as research objects, the electrical performance and mechanical performance were investigated in this paper. On this basis, the con-dition of running composite insulator was effectively evaluated. The results show that the electrical and mechanical properties of the composite insulators running for many years are still eligible for the basic requirements of operation line. The aging characteristic of composite insulators has some correlation with the running time. The test results can provide a reference for the operation and maintenance of composite insulators.?
不同冷藏温度对蜜脆苹果采后生理的影响
倩倩,任小林
食品科学 , 2013,
Abstract: ?研究不同冷藏温度对蜜脆苹果贮藏期生理生化及货架期品质保持的影响,为蜜脆苹果冷藏方式的改进提供理论依据和实践指导。设置不同冷藏温度0℃和3℃,定期测定贮藏期间的各项生理生化指标和货架期品质指标,并在贮藏末期观察统计主要生理病害的病情指数。3℃冷藏与0℃相比,能较好的抑制蜜脆苹果冷藏期间可滴定酸含量的下降,保持果实色泽,推迟呼吸、乙烯高峰的出现,抑制冷害的发生,具有较高的超氧化物歧化酶(superoxidedismutase,sod)、过氧化物酶(peroxidase,pod)和过氧化氢酶(catalase,cat)活性,并能延缓货架期品质的下降,表现出较好的贮藏效果。各项测定指标表明,多数苹果品种适宜贮藏的0℃对蜜脆苹果来说并不适合,3℃更适合蜜脆的冷藏。
多类类别不平衡学习算法:EasyEnsemble.M*
倩倩,刘胥影
模式识别与人工智能 , 2014,
Abstract: 随机欠采样方法忽略潜在有用的大类样本信息,在面对多类分类问题时更为突出。文中提出多类类别不平衡学习算法:EasyEnsemble.M。该算法通过多次针对大类样本随机采样,充分利用被随机欠采样方法忽略的潜在有用的大类样本,学习多个子分类器,利用混合的集成技术最终得到性能较优的强分类器。实验结果表明,与常用的多类类别不平衡学习算法相比,EasyEnsemble.M可有效提高分类器的G-mean值。
从创伤理论视角看电影《喜福会》中的创伤与疗伤
Trauma and Therapy in the Film The Joy Luck Club from the Perspective of Trauma Theory
 [PDF]

倩倩
World Literature Studies (WLS) , 2015, DOI: 10.12677/WLS.2015.34022
Abstract:
电影《喜福会》是一部家喻户晓的影片,近年来对于此作品的研究摆脱不了“东西文化冲突”、“女性主义”、“母女关系”等字眼,本文试图从创伤理论视角全面分析电影中母女的创伤,探讨创伤的来源并寻找疗伤的途径,希望读者从创伤理论视角对影片产生更为深刻的理解,也为华裔女性医治创伤提供借鉴。
The film The Joy Luck Club was a well-known film made on the basis of the novel of the same name. Recent studies mainly focus on the oriental and occidental cultural conflicts, feminism or relationship between mother and daughter. This paper tries to analyze the traumas of the four mothers and their daughters, the reasons for their traumas and possible means to cure traumas from the perspective of trauma theory in order to make readers have a profound understanding about the film and provide reference for Chinese-American women to cure their traumas in real life.
低碳视角下城市空间形态优化策略研究—以西安市为例
Research on Optimization Strategy of the Urban Spatial Form under the Perspective of Low Carbon—A Case Study of Xi’an city
 [PDF]

倩倩, 开宇, 刘美月, , 王垒
Journal of Low Carbon Economy (JLCE) , 2015, DOI: 10.12677/JLCE.2015.43004
Abstract:
在全球变暖的背景下,建设低碳城市已成为世界范围内降低碳排放的重要内容。随着西安城镇化进程不断加快,城市人口增加与建设用地之间的矛盾日益突出,给低碳城市的构建带来更大的挑战。城市空间形态对城市运行及城市各要素具有一定锁定效应,是低碳城市规划的核心手段,低碳城市空间形态已成为低碳城市研究的重要领域。本文以西安市为例,探讨城市空间形态对碳排放的影响机制,并提出低碳城市空间形态优化策略。
Under the background of global warming, the construction of low carbon city has become an im-portant content in the world to reduce carbon emissions. With the accelerating urbanization process in Xi'an, the contradiction between the increase of population and the construction land is increasingly prominent, and it brings more challenges to the construction of low carbon city. Urban spatial form of city operation and all elements of the city with a certain lock-in effect are the core means of the planning of low carbon city. Low carbon urban spatial form has become an important research field of low carbon city. Taking Xi'an city as an example, we discuss the influence mechanism of urban spatial form on carbon emissions, and put forward the optimization strategy of low carbon urban spatial morphology.
有机二阶非线性光学发色团的研究进展有机化学
倩倩, 秦金贵,
有机化学 , 2011,
Abstract: 近年来,科学家们通过引进杂环片段、采用双(或多)官能化以及运用分子间弱相互作用等方法,在二阶非线性光学发色团的性能优化方面取得了较大进展.结合本课题组的研究,对此领域的研究进行了较全面的综述,并特别针对“非线性-透光性”矛盾的解决途径进行了较为详细的介绍.
新型含吲哚基团的光电功能材料*
倩倩,,秦金贵
化学进展 , 2009,
Abstract: 本文较为系统地阐述了吲哚在光电功能材料各个领域的发展概况,主要包括光致变色、电致发光和非线性光学材料。较为全面地总结了吲哚(苯并五元氮杂环)的结构特点和独特的富电子性对光致变色材料和电致发光材料的紫外可见吸收波长、荧光发射波长、发光强度、量子效率等的影响,以及对制约非线性光学材料发展的重要难题之一——非线性和透明性矛盾的克服。
稀土元素Gd掺杂GaN的电子结构和磁学性质研究
王美娜,倩倩,,
- , 2013,
Abstract: 采用基于密度泛函理论(DFT)结合投影缀加平面波(PAW)的方法,通过 VASP软件包计算研究了稀土元素Gd掺杂GaN的晶格参数、形成能、电子态密度、能 带结构和磁学性质.计算过程中将稀土元素Gd的4f电子计入价电子,采用LSDA+U 方法处理4f电子的强关联效应.计算结果表明:Gd原子之间的耦合是反铁磁性的 ,当有足够的空穴载流子存在时能够稳定铁磁相;Ga空位虽然能够提供空穴稳定 铁磁相,但是由于在p型GaN中Ga空位的形成能较高而难以形成;而间隙N缺陷和间 隙O缺陷的形成能较低,能够稳定GaN∶Gd体系的铁磁相并且能够分别引入1 B和 2 B的磁矩,因此认为间隙N和O可能是巨大磁矩的来源.
正颌外科术后外用复方七叶皂苷钠凝胶对患者颌面部肿胀反应影响的效果评价
Evaluation of External Use of Compound Sodium Aescinate Gel for Reducing Postoperative Swelling after Orthognathic Surgery
 [PDF]

蔡娟, 周娜, 刘筱菁, 甄文亚, 倩倩
Nursing Science (NS) , 2015, DOI: 10.12677/NS.2015.41001
Abstract:
目的:研究和评价通过护理干预及外用复方七叶皂苷钠凝胶对正颌外科患者术后面部肿胀的影响,改善正颌外科患者的舒适度,减少发生窒息的危险因素。方法:随机选取正颌外科手术后患者64例,分为对照组和试验组。对照组:按正颌外科术后护理常规,采取缓解患者面部肿胀的方法。试验组:在对照组实施干预措施的基础上,术后每日使用复方七叶皂苷钠凝胶涂擦及按摩患者颌面部,分别于术后第2、4、6天按照肿胀分级评价标准评定颌面部肿胀程度;并采用三维相机获取患者软组织数据,与术后3个月面部轮廓进行配准,重建面部三维模型,观察和分析复方七叶皂苷钠凝胶对面部肿胀程度的效果。结果:两组差异具有统计学意义。正颌外科术后给予护理干预及外用复方七叶皂苷钠凝胶具有一定的减轻患者面部肿胀的作用。
Objective: To evaluate the effect of nursing intervention and external use of compound sodium aescinate gel for reducing postoperative swelling after orthognathic surgery. Method: 64 patients accepting Le Fort I osteotomy, bilateral sagittal split ramus osteotomy (BSSRO) and genioplasty were randomly divided into experiment group and control group. The control group adopted rou-tine nursing to reduce the swelling. Together with routine nursing, the experiment group adopted compound sodium aescinate gel inunction on the face every day after surgery. Degrees of facial swelling were evaluated according to the swelling grading evaluation criterion on postoperative days 2, 4, and 6. 3D photos of the face of the patients were taken and compared with 3D photos three months after surgery to observe and analyze the effect of compound sodium aescinate gel on postoperative swelling. Result: Significant differences were observed between the two groups. After the orthognathic surgery, routine nursing and external use of compound sodium aescinate can help reduce the facial swelling of patients.
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