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Search Results: 1 - 10 of 127120 matches for " Shiqiang Li "
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Cobalt and Nitrogen Co-Doped Nano-Porous Carbon: Synthesis and Application for Lithium-Sulfur Battery  [PDF]
Shiqiang Luo, Chunman Zheng, Yujie Li, Shuangke Liu
Journal of Power and Energy Engineering (JPEE) , 2017, DOI: 10.4236/jpee.2017.512003
S@C-Co-N nanoporous carbon co-doped with cobalt and nitrogen as the cathode of lithium-sulfur battery are prepared. The synthetic route is carried out via the carbonization of metal organic frameworks polyhedron ZIF-67, followed by the heat treatment with sulfur. The SEM images suggest that C-Co-N composite maintains almost the same size and polyhedron shape of ZIF-67. The XRD pattern confirms the existence of cobalt element. As cathode for lithium-sulfur battery, the S@C-Co-N composite delivers a reversible capacity of 916.6 mAh?g?1 at the initial cycle and 460.5 mAh?g?1 after 500 cycles at 0.5 C, with a capacity fading of 0.09% per cycle.
The Theory and Experimental Study of the Self-Excited Oscillation Pulsed Jet Nozzle (Pipeline Pulsed Flow Generator)  [PDF]
Shiqiang Lai, Zhengfang Liao
Natural Resources (NR) , 2013, DOI: 10.4236/nr.2013.45049

In this paper, the basic theories of the Self-excited Oscillation Pulsed Jet Nozzle (SEOPJN) invented by the authors are introduced. Then, some experimental results are shown. According to the results, using tricorn bits assembled the SEOPJN to drill oil well, the rate of penetration (ROP) increases by 8% - 77%, and the rate of the footage for tricorn bit increases by 6.7% - 44%. Although the test was conducted in the water, good result was got in nature gas transportation. The volume of gas transportation could be increased by the Self-excited Oscillation Pulsed generator while the gas pressure drop could be decreased, since it significantly reduced the pressure loss during gas transportation.

Impact Factor Dynamic Forecasting Model for Management Science Journals Based on Grey System Theory  [PDF]
Xiao Dong, Shiqiang Zhang
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.33005

A forecast method of the impact factor trend was given based on grey system theory. Using this method, combined with the top 20 management science journals, the grey system GM (1, 1) model was constructed. The model evaluates and predicts the average impact factor trend of the top 20 management science journals.

Regression Mathematical Model of China Electronic Commerce Transaction Scale Based on Information Reused Analysis Method  [PDF]
Shiqiang Zhang, Xuexia Wei
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.43004

A regression mathematical model of China electronic commerce transaction scale was given based on information reused analysis method. This regression mathematical model could evaluate and predict change tendency of the China electronic commerce transaction volume and could provide reference for electronic commerce transaction researchers.

Present Situation of Mobile Medical Applications  [PDF]
Feng Xu, Shiqiang Zhang
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.43012

Mobile medical Application (APP) is not only the product of the information age but a good helper of modern medical. In this paper, the status of mobile medical APP is described in terms of the implementation of mobile medical App, the classification of mobile medical App, mobile medical App quality and content, problems of mobile medical App.

A Wireless Video Transmission Scheme Based on MAC-independent Opportunistic Routing &Encoding Protocol
Yong Liu,Li Chen,Lifeng Sun,Shiqiang Yang
International Journal of Information Technology and Computer Science , 2010,
Abstract: It is a tremendous challenge to transmit real-time video streams over wireless sensor network because of the poor wireless communication conditions and the high requirements of video transmission. The opportunistic routing protocol can take advantage of the broadcast nature of wireless communication and can improve transfer throughput significantly. But the bigger size of transmission unit also increases the end-to-end delay at the same time. In order to overcome this problem and improve the real-time video transmission quality in wireless video sensor network, we propose a source adaptive frame discard algorithm for MAC-independent Opportunistic Routing & Encoding (MORE) Protocol in this paper. In our approach, the historical transmission delay is recorded to estimate current network transmission rate. Based on the video deadline, frames predicted to be delayed are discarded adaptively in the source node to get better overall video quality. In some practice application scenarios, there are usually need to deliver multiple video streams over multi-hop wireless network. It can’t work effectively with the originally MORE protocol in such scenarios. Furthermore, we modify the MORE protocol and design an adaptive scheme to support multiple video streams over multi-hop wireless video sensor network in this paper. The simulation results show that our algorithm can reduce frame loss rate and improve video quality significantly.
A Video Denoising Method Based on Grouping the Similar Blocks and Surfacelet
Peng Geng,Li Xianbin,Yu Wanhai,Yan Shiqiang
Research Journal of Applied Sciences, Engineering and Technology , 2011,
Abstract: In this study, a novel video denoising method combining similar block matching based on the PDS searching method, grouping these similar block strategy and Surfacelet transform is proposed. Firstly, we apply the SAD block matching criterion and PDS search algorithm which we proposed by searching all frames for blocks which are similar to the currently processed one. In the complex motion case, the method of PDS can effectively decrease the number of search points and search number. Secondly, the matched blocks are put together to stack into some new third dimension sub-video sequences and because of the similarity between them, the data in the video array exists high level of correlation. We apply the surfacelet transform to them and effectively attenuate the noise by solid threshold shrinkage of the coefficients. Finally, inversely transforming the coefficients and obtaining the denoising video according to the obtained locations in the block matching process. This algorithm is obviously better than other 3D Curvlet and 3D wavelet method in the denoising effect and the PSNR is increased about 0.6dB. In terms of visual quality, the proposed method can effectively preserve the video detail, and the trajectory of motion object is very smooth, which is especially suitable to process the video flames with plenty of large area movement object or background change.
Exome Sequencing of 18 Chinese Families with Congenital Cataracts: A New Sight of the NHS Gene
Wenmin Sun, Xueshan Xiao, Shiqiang Li, Xiangming Guo, Qingjiong Zhang
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0100455
Abstract: Purpose The aim of this study was to investigate the mutation spectrum and frequency of 34 known genes in 18 Chinese families with congenital cataracts. Methods Genomic DNA and clinical data was collected from 18 families with congenital cataracts. Variations in 34 cataract-associated genes were screened by whole exome sequencing and then validated by Sanger sequencing. Results Eleven candidate variants in seven of the 34 genes were detected by exome sequencing and then confirmed by Sanger sequencing, including two variants predicted to be benign and the other pathogenic mutations. The nine mutations were present in 9 of the 18 (50%) families with congenital cataracts. Of the four families with mutations in the X-linked NHS gene, no other abnormalities were recorded except for cataract, in which a pseudo-dominant inheritance form was suggested, as female carriers also had different forms of cataracts. Conclusion This study expands the mutation spectrum and frequency of genes responsible for congenital cataract. Mutation in NHS is a common cause of nonsyndromic congenital cataract with pseudo-autosomal dominant inheritance. Combined with our previous studies, a genetic basis could be identified in 67.6% of families with congenital cataracts in our case series, in which mutations in genes encoding crystallins, genes encoding connexins, and NHS are responsible for 29.4%, 14.7%, and 11.8% of families, respectively. Our results suggest that mutations in NHS are the common cause of congenital cataract, both syndromic and nonsyndromic.
Dispersing Instant Social Video Service Across Multiple Clouds
Zhi Wang,Baochun Li,Lifeng Sun,Wenwu Zhu,Shiqiang Yang
Computer Science , 2015,
Abstract: Instant social video sharing which combines the online social network and user-generated short video streaming services, has become popular in today's Internet. Cloud-based hosting of such instant social video contents has become a norm to serve the increasing users with user-generated contents. A fundamental problem of cloud-based social video sharing service is that users are located globally, who cannot be served with good service quality with a single cloud provider. In this paper, we investigate the feasibility of dispersing instant social video contents to multiple cloud providers. The challenge is that inter-cloud social \emph{propagation} is indispensable with such multi-cloud social video hosting, yet such inter-cloud traffic incurs substantial operational cost. We analyze and formulate the multi-cloud hosting of an instant social video system as an optimization problem. We conduct large-scale measurement studies to show the characteristics of instant social video deployment, and demonstrate the trade-off between satisfying users with their ideal cloud providers, and reducing the inter-cloud data propagation. Our measurement insights of the social propagation allow us to propose a heuristic algorithm with acceptable complexity to solve the optimization problem, by partitioning a propagation-weighted social graph in two phases: a preference-aware initial cloud provider selection and a propagation-aware re-hosting. Our simulation experiments driven by real-world social network traces show the superiority of our design.
The Goldbach 3-primes property for polynomial rings over certain infinite fields
Shiqiang Wang
Chinese Science Bulletin , 1998, DOI: 10.1007/BF02884136
Abstract: On the basis of Effinger and Hayes’ theorem about the Goldbach 3-primes property of polynomial rings F[x] over finite fieldsF, by model-theoretic method it is proved that for each characteristick (including 01, there exist infinitely many infinite fieldsF such that F[x] also satisfy Goldbach 3-primes property.
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