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Now showing items 17 - 32 of 148

  • The analysis on the determinants of mobile VIP customer churn: a logistic regression approach

    Su, Qian   Shao, Peiji   Ye, Quanfu  

    According to 20/80 principle, retaining VIP customers is one of the most critical challenges in the maturing mobile telecommunications service market. However, there are little literatures to explain why the VIP customers churn. Using mobile VIP customers' huge transaction and billing database, this study investigates determinants of mobile VIP customer churn. The results indicate that the switching cost: virtual private mobile network (VPMN) and family package are the most important factors in VIP customers churn. However, some marketing tools on ordinary users such as accumulated loyalty points, terminal bound contract do not work on VIP customers, which raise the questions about this marketing programme effectiveness. This study provides implications for the competition policies of mobile telephony market.
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  • Maternal Stress in Gestation: Birth Outcomes and Stress-Related Hormone Response of the Neonates

    Su, Qian   Zhang, Huifang   Zhang, Yanyan   Zhang, Huiping   Ding, Ding   Zeng, Junan   Zhu, Zhongliang   Li, Hui  

    Background Relatively few studies have been made on neurobehavioral outcomes of prenatal maternal stress during the newborn period, and little research has focused on umbilical cord stress hormones including cortisol, adrenocorticotropic hormone (ACTH), norepinephrine, and epinephrine. Our objective was to investigate the effects of prenatal maternal life stressors on neonatal birth outcomes, neurobehavioral development, and stress-related hormones levels. Methods Participants were 142 mothers and their infants; 71 were selected as the prenatal life stressor exposed group and 71 as the control group matched on maternal age, gestational week, delivery type, socioeconomic and education status, and newborns' sex. Maternal life stressors during pregnancy were determined using the Life Events Scale for Pregnant Women. Neonatal neurobehavioral development was assessed with the Neonatal Behavioral Neurological Assessment. Umbilical cord plasma stress-related hormones, including ACTH, cortisol, norepinephrine, and epinephrine were measured using an enzyme-linked immunosorbent assay. Results In the prenatal life stressors exposed group, newborns had significantly lower birth weight, smaller head circumference (p < 0.01, p < 0.01, respectively). Scores of Neonatal Behavioral Neurological Assessment were significantly reduced (p < 0.001). Cord plasma ACTH, norepinephrine, and epinephrine levels were significantly increased (p < 0.001), but cortisol levels were reduced (p < 0.001). Conclusion Prenatal maternal stress may negatively affect fetal birth outcomes, neurobehavioral development and affect neonates' cord plasma ACTH, cortisol, norepinephrine, and epinephrine.
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  • Seismic Stability Analysis of High-Fill Embankment

    Su, Qian   Zhang, Jian   Liu, Bao   Zhang, Li Cai  

    Three problems remained to be solved in the analysis of the seismic stability of high-fill embankment:the pseudo-static method was defective, the embankment damage model was not clear, and the stability evaluation index wasstill to be discussed. It analyzed the dynamic response of a typical transect of high embankment with FEM to find out its instability mechanism. Thenit chose the most dangerous sliding surface and analyzed its stability. The selection of the evaluation index of the seismic stability of high-fill embankment was discussed at last. The results show thatthe upper embankment, especially the shoulder is easily to be damaged. It is too conservative to use the safety factor as the involution index of the seismic stability of high-fill embankment, and the permanent displacement is a better choice.
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  • Transesterfication of isosorbide with dimethyl carbonate catalyzed by task-specific ionic liquids

    Qian, Wei   Tan, Xin   Su, Qian   Cheng, Weiguo   Xu, Fei   Dong, Li   Zhang, Suojiang  

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  • Ultimate Capacity Analysis and Determination of the Position of Failure Surface for Uplift Piles

    Su, Qian   Zhang, Xiaoxi   Yin, Pingbao   Zhao, Wenhui  

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  • Evaluation of Prebiotic Potential of Three Marine Algae Oligosaccharides from Enzymatic Hydrolysis

    Han, Zhen-Lian   Yang, Min   Fu, Xiao-Dan   Chen, Meng   Su, Qian   Zhao, Yuan-Hui   Mou, Hai-Jin  

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  • Micro-Embossing Formability of a Superlight Dual-Phase Mg-Li Alloy Processed by High-Pressure Torsion

    Xu, Jie   Su, Qian   Wang, Chenxi   Wang, Xinwei   Shan, Debin   Guo, Bin   Langdon, Terence G.  

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  • Construction Technique of Pile-Board Subgrade Crossing Over-Shallow-Embedded Metro in Deep Soft Ground

    Su, Qian   Bai, Hao   Liang, Long Biao   Li, Xing  

    Subway shield lining segments are highly sensitive to peripheral soil disturbance. Shield displacement may destroy the whole structure which can not be repaired, and directly affects the subway operation safety at the worst. Therefore, it is necessary to reasonably determine the construction technology, in order to avoid the unfavorable influences caused by construction disturbance. According to the pile-board subgrade scheme which is adopted by the comparison of schemes, also considering the high risk of over-shallow-embedded metro construction, we put forward the key construction technique of pile-board subgrade, including: technique of casing tube bored pile, construction process of pile-board structure and monitoring of settlement and deformation which are important to guide the similar projects.
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  • Mechanism modeling for phase fraction measurement with ultrasound attenuation in oil–water two-phase flow

    Su, Qian   Tan, Chao   Dong, Feng  

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  • Improved performance of the subgrade bed under the slab track of high-speed railway using polyurethane adhesive

    Huang, Jun-Jie   Su, Qian   Cheng, Yung-Ming   Liu, Bao   Liu, Ting  

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  • Oncogenic functions of protein kinase D2 and D3 in regulating multiple cancer-related pathways in breast cancer

    Liu, Yan   Li, Jian   Ma, Zhifang   Zhang, Jun   Wang, Yuzhi   Yu, Zhenghong   Lin, Xue   Xu, Zhi   Su, Qian   An, Li   Zhou, Yehui   Ma, Xinxing   Yang, Yiwen   Wang, Feifei   Chen, Qingfei   Zhang, Yunchao   Wang, Jilinlin   Zheng, Huilin   Shi, Aihua   Yu, Shuang   Zhang, Jingzhong   Zhao, Weiyong   Chen, Liming  

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  • Analysis on Genesis of Frost Damage to Taiyuan-Zhongwei-Yinchuan Railway Subgrade in Seasonal Permafrost Region

    Su, Qian   Jiang, Wei   Yao, Jun Kai   Sun, Wen   Yang, Ling Ling  

    The paper took Taiyuan-Zhongwei-Yinchuan Railway as a background and the study focused on the frost damage there. First of all, the influence on the line operation was mentioned, discussing the status quo and the characteristics of the damage; next, by means of on-site investigation and testing, the phenomenon in the typical frost damage zone along the Railway was analyzed with the damages being classified; simultaneously, taking the track bed and the subgrade bed as the objectives, the damages were studied from the aspect of soil, water and temperature; last, the genesis and mechanism of the frost damage to the Lanzhou-Xinjiang Railway subgrade was generalized, offering the basis of the treatment.
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  • Extracellular expression of a novel β-agarase from Microbulbifer sp. Q7, isolated from the gut of sea cucumber

    Su, Qian   Jin, Tianyi   Yu, Yuan   Yang, Min   Mou, Haijin   Li, Li  

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  • Study on the Effects of Tide-Induced Interface of the Fresh-Saline Groundwater Based on High Density Resistivity

    Su, Qian   Peng, Chang Sheng   Yu, Hong Jun   Xu, Xing Yong   Xu, Xiu Li  

    under the background of global environmental change and the influence of human activities on the environment increasingly significant, the research of continental-oceanic interaction has become the current hot issues in geological field research. The continuous dynamic monitoring of groundwater will be conducted, and technology validation about the dynamic changes of groundwater vary with tidal interactions will be studied in the seawater intrusion area of the laizhou bay using high density electrical method in this research. The results suggest that, If we obtain the value of electrical characteristics of the fresh-saline groundwater by numerically or laboratory experiments, Such as we choose 15 Omega m in Laizhou Bay, we can use high-density electrical to continuous monitor to solve the Scientific Problems of the interface of the fresh-saline groundwater with the effect of tidal variation.
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  • Oxidative Stress Induces Neuronal Apoptosis Through Suppressing Transcription Factor EB Phosphorylation at Ser467

    Su, Qian   Zheng, Bin   Wang, Chen-yao   Yang, Yun-zhi   Luo, Wen-wen   Ma, Shu-min   Zhang, Xin-hua   Ma, Dong   Sun, Yan   Yang, Zhan   Wen, Jin-kun   Liu, Zhi-xue  

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  • On the convergence of the Chinese and Hong Kong stock markets: a cointegration analysis of the A and H shares

    Su, Qian   Chong, Terence Tai-Leung   Yan, Isabel Kit-Ming  

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