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Search Results: 1 - 10 of 104367 matches for " Yanming Zhang "
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Dynamic Pricing of Perishable Products under Consumer Factor  [PDF]
Yanming Ge, Jianxin Zhang
Journal of Service Science and Management (JSSM) , 2011, DOI: 10.4236/jssm.2011.44049
Abstract: With effect of consumer factor considered, a model for dynamic pricing of perishable products is proposed. By this model, we obtained a property of the value function: marginal value is a decreasing function of the capacity and an increasing function of the consumer factor. Basing on this property, we proposed the following pricing strategy: according to the regions that the perishable products are sold, we adopt the appropriate consumer factor and then use the routine pricing strategy. This strategy not only maximizes the retailer’s revenue but also improves its service level. Lastly, a constructive example is discussed.
Study on the Higher Vocational Mode Combining Production with Learning and Research Based on AHP
Yanming Li,Jin Li,Xiumei Zhang
International Education Studies , 2009, DOI: 10.5539/ies.v2n3p185
Abstract: In this article, we applied the AHP method with quantitative analysis and qualitative analysis to analyze three sorts of basic educational mode combining production with learning and research, i.e. the automated instruction, the mode combining production and learning, and the integration combining production with learning and research, and obtained that the educational mode combining production with learning and research was the optimal mode to realize the value of the higher vocational education.
Influence of liquid water on coalbed methane adsorption: An experimental research on coal reservoirs in the south of Qinshui Basin
Shuxun Sang,Yanming Zhu,Jing Zhang,Xiaodong Zhang,Shiyin Zhang
Chinese Science Bulletin , 2005, DOI: 10.1007/BF03184087
Abstract: Using Isothermal Adsorption/Desorption System Model IS-100 and Electrohydraulic Servo Rock System Model MTS815 as the main apparatuses and collecting samples from the major coal reservoirs in the south of Qinshui Basin, a hot point region of coalbed methane exploration, the paper carries out systematical comparisons of the isothermal adsorption experimental data for injection water coal samples, equilibrium moisture samples and dry coal samples, probes and establishes an experimental method of injection water coal sample preparation and isothermal experiment to simulate real reservoir conditions, and then summaries the experimental regulations and discusses the mechanism of liquid water influencing coal methane adsorption. Results of the experiment indicate that: The Langmuir volume of injection water coal samples is notably larger than that of equilibrium moisture samples, as well as larger than or equivalent to that of dry coal samples; the Langmuir pressure of injection water coal samples is the highest, the next is equilibrium moisture samples, while the dry samples is the lowest, of which the experimental results of injection water samples to simulate real reservoir conditions are more close to the fact. Under the conditions of in-position reservoirs, liquid water in coals has evident influence on methane adsorption ability of coal matrix, which can increase the adsorbability of coal and make the adsorption regulation fit to Langmuir model better. Its major reason is the increase of wetting coal matrix adsorbability. The above experimental results overthrow the conventional cognition that liquid water has no influence on coalbed methane adsorption, which may lead to an improvement of the coalbed methane isothermal adsorption experimental method and of the reliability of coalbed methane resource evaluation and prediction.
Single nucleotide polymorphisms in thymic stromal lymphopoietin gene are not associated with allergic rhinitis susceptibility in Chinese subjects
Zhang Yuan,Song Xiaohong,Zhao Yanming,Zhang Luo
BMC Medical Genetics , 2012, DOI: 10.1186/1471-2350-13-79
Abstract: Background Thymic stromal lymphopoietin (TSLP) is an epithelial cell-derived cytokine, implicated in the development and progression of allergic diseases. Recent studies have demonstrated significantly increased expression and synthesis of TSLPin nasal mucosa of patients with allergic rhinitis (AR), compared with nonallergic control subjects. Also, there is significant correlation between the level of TSLP mRNA and symptom severity in AR patients. In this study, we investigated whether polymorphisms in the TSLP gene were associated with increased risk of AR in the Chinese population. Methods In a candidate gene association study, we tested 11 single nucleotide polymorphisms (SNPs) in the TSLP gene in 368 AR and 325 control adult Han Chinese subjects from Beijing. The 11 SNPs were selected from the Chinese HapMap genotyping dataset to ensure complete genetic coverage. AR was established by questionnaire and clinical examination, and blood was drawn from all subjects for DNA extraction. The PLINK software package was used to perform statistical testing. Results In the single-locus analysis of AR risk, no significant differences in allele and genotype frequencies were found between AR and control subjects. Further logistic regression analyses adjusted for age and gender also failed to reveal significant associations between AR and the selected SNPs. Similarly, analysis stratified by gender, and haplotype or diplotype did not reveal any association with AR risk. Conclusion Although TSLP presents itself as a good candidate for contributing to allergy, this study failed to find an association between specific SNPs in the TSLP gene and AR susceptibility in the Han Chinese population.
Study on Value Chain of Telecom VAS under Transformation Background  [PDF]
Yanming TAN, Jianqiu ZENG
Communications and Network (CN) , 2009, DOI: 10.4236/cn.2009.12010
Abstract: Driven by both technology and market, telecom industry is becoming a part of several converged industries in information society gradually from an independent industry which provides telecom products like voice or data. Under such background, this paper introduces a new value chain model of telecom value-added ser-vices in the new environment, providing theoretic support for transformation of telecom operators.
Enhanced Expression of Vacuolar H+-ATPase Subunit E in the Roots Is Associated with the Adaptation of Broussonetia papyrifera to Salt Stress
Min Zhang, Yanming Fang, Zhenhai Liang, Libin Huang
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0048183
Abstract: Vacuolar H+-ATPase (V-H+-ATPase) may play a pivotal role in maintenance of ion homeostasis inside plant cells. In the present study, the expression of V-H+-ATPase genes was analyzed in the roots and leaves of a woody plant, Broussonetia papyrifera, which was stressed with 50, 100 and 150 mM NaCl. Moreover, the expression and distribution of the subunit E protein were investigated by Western blot and immunocytochemistry. These showed that treatment of B. papyrifera with NaCl distinctly changed the hydrolytic activity of V-H+-ATPase in the roots and leaves. Salinity induced a dramatic increase in V-H+-ATPase hydrolytic activity in the roots. However, only slight changes in V-H+-ATPase hydrolytic activity were observed in the leaves. In contrast, increased H+ pumping activity of V-H+-ATPase was observed in both the roots and leaves. In addition, NaCl treatment led to an increase in H+-pyrophosphatase (V-H+-PPase) activity in the roots. Moreover, NaCl treatment triggered the enhancement of mRNA levels for subunits A, E and c of V-H+-ATPase in the roots, whereas only subunit c mRNA was observed to increase in the leaves. By Western blot and immunocytological analysis, subunit E was shown to be augmented in response to salinity stress in the roots. These findings provide evidence that under salt stress, increased V-H+-ATPase activity in the roots was positively correlated with higher transcript and protein levels of V-H+-ATPase subunit E. Altogether, our results suggest an essential role for V-H+-ATPase subunit E in the response of plants to salinity stress.
Effectiveness of 10 polymorphic microsatellite markers for parentage and pedigree analysis in plateau pika (Ochotona curzoniae)
Kexin Li, Jianing Geng, Jiapeng Qu, Yanming Zhang, Songnian Hu
BMC Genetics , 2010, DOI: 10.1186/1471-2156-11-101
Abstract: The error in parentage assignment using a combination of these 10 loci was very low as indicated by their power of discrimination (0.803 - 0.932), power of exclusion (0.351 - 0.887), and an effectiveness of the combined probability of exclusion in parentage assignment of 99.999%.All the offspring of a family could be assigned to their biological mother; and their father or relatives could also be identified. This set of markers therefore provides a powerful and efficient tool for parentage assignment and other population analyses in the plateau pika.Plateau pikas (Ochotona curzoniae) are small lagomorphs that inhabit the high alpine grasslands of the Tibetan plateau of China. They live in cohesive families and occupy burrow systems. Plateau pikas exhibit monogamy, polygyny, polyandry and promiscuous mating systems [1]. Approximately 57.8% of pikas exhibit philopatry, and dispersal movements are extremely restricted, although some dispersal may occur to ensure spatial separation of kin that may otherwise mate [2]. Inbreeding would be expected to occur under these circumstances. Dominant males monopolize mating in order to maximise reproductive fitness and minimise inbreeding depression. Previous methods to determine the level of inbreeding and how it affects the population depended mainly on direct observation due to the lack of molecular tools. Although family group behaviors have been described through observation in the plateau pika [2-5], details of family structures lack corroborative molecular evidence. In some breeding systems such as lekking, polygyny, polyandry and cooperative breeding, it may be impossible to determine parentage from direct observations [6]. Therefore, molecular tools such as microsatellites markers are necessary to obtain genetic information about family structure, social behavior and dispersal. Microsatellite markers, also called short tandem repeats (STRs), are ideal molecular markers for various genetic studies because they are highly p
Association of p21 SNPs and risk of cervical cancer among Chinese women
Wang Ning,Wang Shizhuo,Zhang Qiao,Lu Yanming
BMC Cancer , 2012, DOI: 10.1186/1471-2407-12-589
Abstract: Background The p21 codon 31 single nucleotide polymorphism (SNP), rs1801270, has been linked to cervical cancer but with controversial results. The aims of this study were to investigate the role of p21 SNP-rs1801270 and other untested p21 SNPs in the risk of cervical cancer in a Chinese population. Methods We genotyped five p21 SNPs (rs762623, rs2395655, rs1801270, rs3176352, and rs1059234) using peripheral blood DNA from 393 cervical cancer patients and 434 controls. Results The frequency of the rs1801270 A allele in patients (0.421) was significantly lower than that in controls (0.494, p = 0.003). The frequency of the rs3176352 C allele in cases (0.319) was significantly lower than that in controls (0.417, p < 0.001).The allele frequency of other three p21 SNPs showed not statistically significantly different between patients and controls. The rs1801270 AA genotype was associated with a decreased risk for the development of cervical cancer (OR = 0.583, 95%CI: 0.399 - 0.853, P = 0.005). We observed that the three p21 SNPs (rs1801270, rs3176352, and rs1059234) was in linkage disequilibrium (LD) and thus haplotype analysis was performed. The AGT haplotype (which includes the rs1801270A allele) was the most frequent haplotype among all subjects, and both homozygosity and heterozygosity for the AGT haplotype provided a protective effect from development of cervical cancer. Conclusions We show an association between the p21 SNP rs1801270A allele and a decreased risk for cervical cancer in a population of Chinese women. The AGT haplotype formed by three p21 SNPs in LD (rs1801270, rs3176352 and rs1059234) also provided a protective effect in development of cervical cancer in this population.
Polydimethylsiloxane and Castor Oil Comodified Waterborne Polyurethane
Xuan Ji,Yanming Zhou,Baoling Zhang,Caiying Hou,Guozhang Ma
ISRN Polymer Science , 2013, DOI: 10.1155/2013/284683
Abstract: In view of both improving properties of waterborne polyurethane (WPU) and sufficient utilization of renewable resources, a series of polydimethylsiloxane (PDMS) and castor oil (C.O.) comodified anionic WPUs with internal cross-linking was prepared through a prepolymer mixing process. The chemical structure of synthesized polymers was characterized by Fourier transforms infrared spectroscopy (FT-IR). In comparison with traditional linear WPU synthesized from petroleum-based polyols, these novel WPU films exhibited superior properties in solvent and water resistance, thermal stability, and mechanical strength, which suggest promising applications of these new environmentally friendly materials, particularly in the area of decorative and protective coatings. In addition, the results showed that with the increase in PDMS content in these co-modified WPUs the average particle size, the water resistance, and the thermal stability increased accordingly while the solvent resistance and the mechanical properties decreased. 1. Introduction Waterborne polyurethane (WPU) dispersions, one of the most rapidly developing and active branches of PU chemistry and technology, have gained great attention in many commercial fields due to their superior properties and environmental advantages relative to conventional solvent-borne polyurethanes [1, 2]. However, some properties of WPU still need to be improved further, such as water and solvent resistance, thermal stability, and mechanical properties. The improvements of these properties have been achieved by copolymerizing or grafting of other polymers, external and internal cross-linking, blending or interpenetrating, polymer network formations, and modifying with nanoparticles [3–7]. Polydimethylsiloxane (PDMS) has many applications due to its unique properties, which arise mainly from its natural structure composed of inorganic Si–O bond and organic graft methyl group. These interesting properties include low surface energy, biocompatibility, high thermal and oxidative stability, good water resistance, chemical inactivity, insulating stability, low glass transition temperature, and great molecular flexibility [8]. Combining the advantages of PDMS with those of WPU has attracted the attention of many researchers for a long time and PDMS has been introduced to WPU through both blending and copolymerization methods [8–16]. Although these linear PDMS-WPU “hybrids” showed much better heat and water resistance than that of WPU, the incorporation of PDMS often has a negative effect on the physical mechanical properties of WPU,
Constructing optimal local pseudopotentials from first principles
Wenhui Mi,Shoutao Zhang,Yanming Ma,Maosheng Miao
Physics , 2015,
Abstract: Local pseudopotential (LPP) is an important component of the orbital free density functional theory (OF-DFT), which is a promising large scale simulation method that can still maintain information of electron state in materials. Up to date, LPP is usually extracted from the solid state DFT calculations. It is unclear how to assess its transferability while applying to a much different chemical environment. Here we reveal a fundamental relation between the first principles norm-conserving PP (NCPP) and the LPP. Using the optimized effective potential method developed for exchange functional, we demonstrate that the LPP can be constructed optimally from the NCPP for a large number of elements. Our theory also reveals that the existence of an LPP is intrinsic to the elements, irrespective to the parameters used for the construction. Our method provides a unified method in constructing and assessing LPP in the framework of first principles pseudopotentials.
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