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Search Results: 1 - 10 of 10708 matches for " Quan Qu "
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Quasi-Einstein and Generalized Quasi-Einstein Warped Products with an Affine Connection
Quan Qu
Mathematics , 2015,
Abstract: In this paper, we study the quasi-Einstein and generalized quasi-Einstein warped products with a semi-symmetric non-metric connection. We give the expressions of the Ricci tensors and scalar curvatures for the bases and fibres. In some cases we give some obstructions to the existence of the quasi-Einstein and generalized quasi-Einstein warped products with a semi-symmetric non-metric connection.
Killing Vector Fields on Multiply Warped Products with a Semi-symmetric Metric Connection
Quan Qu
Mathematics , 2015,
Abstract: In this paper, we define a semi-symmetric metric Killing vector field, then study semi-symmetric metric Killing vector fields on warped and multiply warped products with a semi-symmetric metric connection. We also study Killing and 2-Killing vector fields on multiply warped products.
An Empirical Study Based on Supply Chain Supplier Evaluation System  [PDF]
Quan Qu, Lina Fang, Yu Hou
Journal of Service Science and Management (JSSM) , 2016, DOI: 10.4236/jssm.2016.95045
Abstract: Under the environment of supply chain, enterprises not only put forward higher request to the product itself, but also focus more on the supplier selection criteria. In the early stage of the supply chain construction enterprises, we will find that there are many outstanding suppliers to choose from; facing a large number of suppliers, an effective way of supplier evaluation is very important. In this paper, the principal component analysis method is applied in supplier evaluation index, by extracting the principal components of the multi index comprehensive evaluation, and quantitatively provides guidance and reference for the selection of suppliers for the enterprises in the supply chain.
Multiply Warped Products with a Quarter-symmetric Connection
Quan Qu,Yong Wang
Mathematics , 2014,
Abstract: In this paper, we study the Einstein warped products and multiply warped products with a quarter-symmetric connection. We also study warped products and multiply warped products with a quarter-symmetric connection with constant scalar curvature. Then apply our results to generalized Robertson-Walker spacetimes with a quarter-symmetric connection and generalized Kasner space-times with a quarter-symmetric connection.
Flow Characteristics of Deionized Water in Microtubes Absorbing Fluoro-Alkyl Silanes

QU Chao,SONG Fu-Quan,

中国物理快报 , 2011,
Human Coding Synonymous Single Nucleotide Polymorphisms at Ramp Regions of mRNA Translation
Quan Li, Hui-Qi Qu
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0059706
Abstract: According to the ramp model of mRNA translation, the first 50 codons favor rare codons and have slower speed of translation. This study aims to detect translational selection on coding synonymous single nucleotide polymorphisms (sSNP) to support the ramp theory. We investigated fourfold degenerate site (FFDS) sSNPs with A?G or C?T substitutions in human genome for distribution bias of synonymous codons (SC), grouped by CpG or non-CpG sites. Distribution bias of sSNPs between the 3rd ~50th codons and the 51st ~ remainder codons at non-CpG sites were observed. In the 3rd ~50th codons, G→A sSNPs at non-CpG sites are favored than A→G sSNPs [P = 2.89×10?3], and C→T at non-CpG sites are favored than T→C sSNPs [P = 8.50×10?3]. The favored direction of SC usage change is from more frequent SCs to less frequent SCs. The distribution bias is more obvious in synonymous substitutions CG(G→A), AC(C→T), and CT(C→T). The distribution bias of sSNPs in human genome, i.e. frequent SCs to less frequent SCs is favored in the 3rd ~50th codons, indicates translational selection on sSNPs in the ramp regions of mRNA templates.
Diffraction properties of transmission binary blazed grating
Hui-Jun Zhou,Qu-Quan Wang
Optica Applicata , 2006,
Abstract: The properties of binary blazed grating were theoretically analyzed with finite-difference time-domain (FDTD) method. The diffraction efficiencies and diffraction angles of –1, 0, and +1 order for the grating varying with wavelength, grating structure, and the etch depth were studied when the incident angle was 30°. The numerical simulations revealed that the binary blazed grating presented high stability of diffraction efficiencies with wavelength shift.
Efficient Resource Reservation Scheme in Service-Oriented Network Environment
Kaijian Liang,Linfeng Bai,Quan Liang,Xilong Qu
Journal of Networks , 2012, DOI: 10.4304/jnw.7.3.568-575
Abstract: How to safeguard the quality of service (QoS) for users is an important issue in network computing task and resource reservation is one of the technologies. However, errors such as resource failure and reservation time overlap often result in reservation failure. To address these problems, this paper proposes a resource reservation method, using adjacency list reservation constructor (ALRC) to store all proper resources founded in resource selection phase in ALRC structure; when the reserved resource fails, directly select alternative resources in ALRC to ensure the reservation reliability. According to different reservation strategies, this paper designs a resource reservation algorithm based on ALRC; the related performance analysis and simulation experiment show that this algorithm is effective and reliable.
The Innovation and Perfection of Chinese Enterprise Form  [PDF]
Nannan Qu
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.38007
Abstract: China’s enterprise form adopts legal principle, lack of flexibility and innovation, which restricts the development of China’s economy. The latest revision of the company law has abolished the restriction of registered capital and loosened of market access, and has brought the opportunity and challenge to the innovation and perfection of enterprise form. This paper mainly discusses the value of the guarantee of Limited Liability Company based on the foreign experience to innovate and perfect our country’s enterprise form, and to better promote the development of the socialist market economy.
Research on the Legal System of the Export Credit Insurance in China’s Foreign Trade  [PDF]
Nannan Qu
Voice of the Publisher (VP) , 2015, DOI: 10.4236/vp.2015.12007
Abstract: With China’s export trade launches extensively, and the relevant trade systems obtain the unceasing development, but the credit insurance system is not perfect, such as the speed and the scale of China’s export credit insurance system are far from the requirements of the international trade development and the related legal system requires to be further strengthened. This article analyzes the export credit insurance’s concept, characteristics and functions as well as problems of the related legal system of China’s export credit insurance at the present stage, and proposes some suggestions to strengthen China’s export credit insurance system in order to promote the improvement of related legal system, better for China’s export trade services.
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