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Search Results: 1 - 10 of 32725 matches for " Qianqian Huang "
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5,8-Dibromo-14,15,17,18-tetramethyl-2,11-dithia[3.3]paracyclophane
Shuyuan Huang,Qianqian Wang
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810026760
Abstract: In the title molecule [systematic name: 12,15-dibromo-52,53,55,56-tetramethyl-3,7-dithia-1,5(1,4)-dibenzenacyclooctaphane], C20H22Br2S2, the distance between the centroids of the two benzene rings is 3.326 (4) , and their mean planes are almost parallel, forming a dihedral angle of 1.05 (7)°. The crystal packing exhibits no intermolecular contacts shorter than the sum of van der Waals radii.
A Comparative Study of China-U.S. Tourism Characteristic Industry GVC1 Embedment Degree  [PDF]
Qianqian Wang
American Journal of Industrial and Business Management (AJIBM) , 2018, DOI: 10.4236/ajibm.2018.86104
Abstract: As the largest branch of service trade, tourism trade has contributed continuously to the global economy. Starting from the related departments of tourism trade, this article used the method of Wang et al. (2013) to conduct value-added decomposition of the global input-output table for the period 2000-2014 and measured the GVC position and GVC participation index between China and the United States for first time. The author just intends to consider the related tourism industries, but it didn’t integrate the related industries to a complete tourism industry. The comparative study found that Chinas road transportation sector has advantage over the United States’, but overall the GVC position and GVC participation index of China tourism characteristic departments are less than the United States’. For the whole embedment degree of GVC, there is still a gap between China and the United States.
Economic Cycle, Uncertainty of Economic Policy and Cash Holding of Listed Companies  [PDF]
Qianqian Wang
Modern Economy (ME) , 2019, DOI: 10.4236/me.2019.101019
Abstract:

Based on the systematic review and economic analysis of the theoretical literature, we consider not only the impact of the economic cycle or the economic policy uncertainty (EPU) on the cash holding ratio, but also the comprehensive impact of the two on the cash holding rate. We raise the research hypothesis by using the data from 2004-2015 in the A-share listed companies which are listed in Shanghai and Shenzhen securities exchange as research samples. The empirical results show that: 1) There are respectively negative correlation between the economic cycle and the cash holding of listed companies, and positive correlation between the EPU and the cash holding. 2) During the boom, the cash holdings are significantly positive with the current EPU and the last stage; during the recession, the cash holdings of listed companies is significantly negatively correlated with the current EPU, while positive with the last stage. 3) We further examine the role of the economic cycle and the EPU on the cash holding value, and find that EPU will reduce the cash holding value. 4) When the economy is booming, the increase in EPU will reduce the market value of corporate cash holdings, but it is not significant. During recession, the increase in EPU will increase the market value of cash holdings.

An analysis of farmers' perception of the new cooperative medical system in Liaoning Province, China
Xilong Pan, Ying Zhang, Li Xu, Ju Huang, Qianqian Zhao
BMC Health Services Research , 2009, DOI: 10.1186/1472-6963-9-230
Abstract: The data for this study were collected from a survey involving twenty counties in Liaoning Province. Interviews and focus groups were conducted between 10th January and 20th August 2008. A total of 2,780 people aged 18-72 were randomly selected and interviewed. Data were evaluated by nonparametric tests and ordinal regression models.71.6% of the study subjects were satisfied with the NRCMS. Single factor analysis showed that attitudes towards the NRCMS were influenced by gender, age, marital status, and self-rated health status. In the ordinal regression analysis, gender, age, and self-rated health status affect satisfaction (P < 0.05).We found that a considerable proportion of farmers were satisfied with the NRCMS. Gender, age, and self-rated health status had significant effects on farmers' attitudes towards the NRCMS. The Chinese Central Government attempted to adopt active measures in the future to continuously improve the NRCMS, including initiating educational programs, building new medical facilities and increasing financial investment.The New Cooperative Medical System (NCMS) is a main component of the Chinese new rural medical insurance system. The development of Chinese rural medical insurance system has gone through three stages:The forming period of the Cooperative Medical System (CMS) (1958-1980s): Before 1958, economic development was slow in rural China. No medical insurance system existed. In 1958, the National People's Congress of China (NPC) decided that the rural cooperative community, which was based on traditional geographic village, should be built as the most fundamental government agency in rural areas,. The CMS was established in the rural cooperative community to provide basic medical insurance to the community memembers, and in return each member made fixed contribution to CMS every year. Thus the communitymembers were insured by the CMS in case they needed medical care. This system played a significant role in promoting healthcare in rura
Robust Statistical Ranking: Theory and Algorithms
Qianqian Xu,Jiechao Xiong,Qingming Huang,Yuan Yao
Computer Science , 2014,
Abstract: Deeply rooted in classical social choice and voting theory, statistical ranking with paired comparison data experienced its renaissance with the wide spread of crowdsourcing technique. As the data quality might be significantly damaged in an uncontrolled crowdsourcing environment, outlier detection and robust ranking have become a hot topic in such data analysis. In this paper, we propose a robust ranking framework based on the principle of Huber's robust statistics, which formulates outlier detection as a LASSO problem to find sparse approximations of the cyclic ranking projection in Hodge decomposition. Moreover, simple yet scalable algorithms are developed based on Linearized Bregman Iteration to achieve an even less biased estimator than LASSO. Statistical consistency of outlier detection is established in both cases which states that when the outliers are strong enough and in Erdos-Renyi random graph sampling settings, outliers can be faithfully detected. Our studies are supported by experiments with both simulated examples and real-world data. The proposed framework provides us a promising tool for robust ranking with large scale crowdsourcing data arising from computer vision, multimedia, machine learning, sociology, etc.
The Impact of Chemotherapy on EGFR Mutation Status in Non-Small-Cell Lung Cancer: A Meta-Analysis  [PDF]
Xiaoshun Shi, Fuxi Huang, Allen M. Chen, Zhuolin Wu, Qianqian Huang, Ying Liang, Qipeng Zhou, Haiyun Mo, Xiaoxiang Li, Jiexia Zhang
Open Journal of Genetics (OJGen) , 2017, DOI: 10.4236/ojgen.2017.74010
Abstract: Background: Emerging evidence indicates that chemotherapy for lung cancer may alter EGFR mutation status. However, whether chemotherapy as a firstline treatment may increase or reduce the frequency of EGFR mutations in NSCLC remains uncertain. Therefore, we conducted a meta-analysis to evaluate whether chemotherapy leads to altered EGFR mutation status. Methods: A systematic literature search was performed using the PubMed, OVID, Science Direct, Cochrane Library, and CNKI databases for studies on pre- and post-chemotherapy EGFR mutation status. Relevant studies documenting perichemotherapy EGFR mutation ratios were included. Analyses of pooled odds ratios (OR) were performed. Results: Six studies involving 656 patients were included in this meta-analysis. It was found that chemotherapy may alter EGFR status (OR = 1.93, 95% CI 1.05 - 3.56; p < 0.0001). No significant differences in EGFR mutation alterations were observed in terms of gender, smoking history, EGFR loci, or chemotherapy response in NSCLC patients. Conclusions: Chemotherapy may contribute to altered EGFR status. NSCLC patients with EGFR mutations might need to be considered for EGFR status redeterminations prior to second-line EGFR-TKI treatment or upon tumor recurrence after chemotherapy. Further randomized clinical trials should investigate the impact of neoadjuvant or first-line chemotherapy on EGFR mutation status in NSCLC patients.
Compressing Information of Target Tracking in Wireless Sensor Networks  [PDF]
Jianzhong Li, Qianqian Ren
Wireless Sensor Network (WSN) , 2011, DOI: 10.4236/wsn.2011.32008
Abstract: Target tracking is a well studied topic in wireless sensor networks. It is a procedure that nodes in the network collaborate in detecting targets and transmitting their information to the base-station continuously, which leads to data implosion and redundancy. To reduce traffic load of the network, a data compressing based target tracking protocol is proposed in this work. It first incorporates a clustering based data gather method to group sensor nodes into clusters. Then a novel threshold technique with bounded error is proposed to exploit the spatial correlation of sensed data and compress the data in the same cluster. Finally, the compact data presentations are transmitted to the base-station for targets localization. We evaluate our approach with a comprehensive set of simulations. It can be concluded that the proposed method yields excellent performance in energy savings and tracking quality.
Comparative Study and Analysis of the Development of Shale Gas between China and the USA  [PDF]
Qianqian Wang, Lu Wang
International Journal of Geosciences (IJG) , 2016, DOI: 10.4236/ijg.2016.72016
Abstract: In the 21stcentury, the shale gas is a greatly potential unconventional gas resource, which can serve as an important complement to conventional energy sources, and can effectively alleviate the energy pressure of the world. The development of shale gas in the USA is in the developing stage with advanced exploitation technology and huge reserves. Compared with the USA, the development of shale gas in China is still in the early stage. The development of shale gas is both an opportunity and a challenge. Chinais in the exploration and preparation stage of resource assessment and exploration. This paper presents the importance of the formation principle of shale gas and the energy application, and compares the progress of shale gas studies, exploitation technology as well as the study hot-points betweenChinaand theUSA. Meanwhile, this paper states the difficulties and challenges with the development of shale gas inChina.
Prediction of the Favorable Area for the Development of Fracture in Mud-Shale of Wufeng-Longmaxi Formation in Jiaoshiba Area, Sichuan Basin  [PDF]
Qianqian Wang, Lu Wang
Open Journal of Geology (OJG) , 2016, DOI: 10.4236/ojg.2016.63014
Abstract: The main reservoir stratum of shale gas in the Jiaoshiba area, Sichuan basin is Wufeng-Longmaxi Formations. This paper calculates the tectonic difference stress values of JY1 well in different depths and numerically simulates the shale gas reservoir by elasto-plastic incremental method. The results of tectonic difference stress value suggest that the present tectonic stress values distribute strippedly in plane. The areas in favor of the development of fractures are stripped and mostly distributed in the northeast, middle and southwest of Jiaoshiba area, where the shale gas is concentrated.
The Some Properties of Skew Polynomial Rings  [PDF]
Qianqian Chu, Hailan Jin
Advances in Pure Mathematics (APM) , 2016, DOI: 10.4236/apm.2016.67037
Abstract: This paper mainly studies some properties of skew polynomial ring related to Morita invariance, Armendariz and (quasi)-Baer. First, we show that skew polynomial ring has no Morita invariance by the counterexample. Then we prove a necessary condition that skew polynomial ring constitutes Armendariz ring. We lastly investigate that condition of skew polynomial ring is a (quasi)-Baer ring, and verify that the conditions is necessary, but not sufficient by example and counterexample.
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