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Search Results: 1 - 10 of 26835 matches for " Zhengping Jin "
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Synthesis of Novel Porphyrin and its Complexes Covalently Linked to Multi-Walled Carbon Nanotubes and Study of their Spectroscopy
Jin Jun,Dong Zhengping,He Jianguo,Li Rong
Nanoscale Research Letters , 2009,
Abstract: Novel covalent porphyrin and its complexes (Co2+, Zn2+) functionalized multi-walled carbon nanotubes (MWNTs) have been successfully synthesized by the reaction of the carboxyl on the surface of MWNTs which was synthesized to use carbon radicals generated by the thermal decomposition of azodiisobutyronitrile (AIBN) with 5-p-hydroxyphenyl-10,15,20-triphenyl-porphyrin and its complexes (Co2+, Zn2+). Three resulting nanohybrids were characterized by spectroscopy (FT-IR, Raman, and UV-vis), TGA, and TEM. The quality of porphyrin attached to the MWNTs was determined from thermogravimeric analysis (TGA) of the MWNTs, which showed a weight loss of about 60%. The Raman and absorption spectroscopy data showed that the electronic properties of modified MWNTs were mostly retained, without damaging their one-dimensional electronic properties. From fluorescence measurements, it was observed that the porphyrin and its complexes (Co2+, Zn2+) were nearly quenched by MWNTs, indicating that this covalently modified mode facilitated the effective energy or electron transfer between the excited porphyrin moiety and the extended π-system of MWNTs.
Quinoline Group Modified Carbon Nanotubes for the Detection of Zinc Ions
Dong Zhengping,Yang Bin,Jin Jun,Li Jing
Nanoscale Research Letters , 2009,
Abstract: Carbon nanotubes (CNTs) were covalently modified by fluorescence ligand (glycine-N-8-quinolylamide) and formed a hybrid material which could be used as a selective probe for metal ions detection. The anchoring to the surface of the CNTs was carried out by the reaction between the precursor and the carboxyl groups available on the surface of the support. Fourier transform infrared spectroscopy (FTIR) and Thermogravimetric analysis (TGA) unambiguously proved the existence of covalent bonds between CNTs and functional ligands. Fluorescence characterization shows that the obtained organic–inorganic hybrid composite is highly selective and sensitive (0.2 μM) to Zn(II) detection.
Cryptanalysis and improvement of two certificateless three-party authenticated key agreement protocols
Haiyan Sun,Qiaoyan Wen,Hua Zhang,Zhengping Jin,Wenmin Li
Computer Science , 2013,
Abstract: Recently, two certificateless three-party authenticated key agreement protocols were proposed, and both protocols were claimed they can meet the desirable security properties including forward security, key compromise impersonation resistance and so on. Through cryptanalysis, we show that one neither meets forward security and key compromise impersonation resistance nor resists an attack by an adversary who knows all users' secret values, and the other cannot resist key compromise impersonation attack. Finally, we propose improved protocols to make up two original protocols' security weaknesses, respectively. Further security analysis shows that our improved protocols can remove such security weaknesses.
Conditionally Suboptimal Filtering in Nonlinear Stochastic Differential System  [PDF]
Tongjun He, Zhengping Shi
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.26101
Abstract: This paper presents a novel conditionally suboptimal filtering algorithm on estimation problems that arise in discrete nonlinear time-varying stochastic difference systems. The suboptimal state estimate is formed by summing of conditionally nonlinear filtering estimates that their weights depend only on time instants, in contrast to conditionally optimal filtering, the proposed conditionally suboptimal filtering allows parallel processing of information and reduce online computational requirements in some nonlinear stochastic difference system. High accuracy and efficiency of the conditionally suboptimal nonlinear filtering are demonstrated on a numerical example.
A Quantity Discount Pricing Model Based on the Standard Container under Asymmetric Information  [PDF]
Zhengping DING, Keyi WANG
Journal of Service Science and Management (JSSM) , 2009, DOI: 10.4236/jssm.2009.23026
Abstract: A supply chain system is studied, in which the information about the retailer’s storage cost is usually asymmetric. This paper studies the inventory control in the system and presents a quantity discount pricing model for inventory coordination based on the standard container, a transport tool from the supplier to the retailer with a fixed size. First, it investigates the inventory models under full information. Before inventory coordination, the supplier and the retailer my-opically choose their lot sizes, which is not the optimal decision for the whole system. Then, it presents an incentive scheme under asymmetric information from the point of view of the supplier. It also discusses the solution and the distribution of the incremental profits after the incentive scheme is adopted by both the supplier and the retailer. A con-stant in the model, which affects the distribution of the incremental profits, is optimized for the supplier by using numerical analysis. Finally, an example illustrates the application of the model. After inventory coordination, both the supplier and the retailer have a positive incremental profit.
Prognostic Value of Isocitrate Dehydrogenase Mutations in Myelodysplastic Syndromes: A Retrospective Cohort Study and Meta-Analysis
Jie Jin, Chao Hu, Mengxia Yu, Feifei Chen, Li Ye, Xiufeng Yin, Zhengping Zhuang, Hongyan Tong
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0100206
Abstract: Background Recent genomic sequencing efforts have identified a number of recurrent mutations in myelodysplastic syndromes (MDS) that may contribute to disease progression and overall survival, including mutations in isocitrate dehydrogenases 1 and 2 (IDH1 and IDH2). Methods Pretreatment bone marrow (BM) samples were acquired from mononuclear cells in 146 adult patients with de novo MDS from January 2006 to June 2013. Polymerase chain reaction (PCR) and direct sequencing were performed on exon 4 of IDH1/2 genes and mutation status was correlated with overall survival (OS) and leukemia-free survival (LFS). We then performed a meta-analysis combining previously published and current studies to explore the effect of IDH mutations on OS and LFS in MDS. Results In our study, somatic mutations of either IDH gene were discovered in 11 MDS patients (7.53%) and were significantly correlated with poorer OS (P = 0.007). IDH mutations were specifically associated with a poorer OS in the intermediate-1 risk group by the International Prognostic Scoring System (IPSS) (P = 0.039). In addition, we discovered decitabine achieved a better therapeutic effect compared to other treatments in IDH mutation-positive patients (P = 0.023). We identified six previous studies of IDH mutations in MDS. A meta-analysis of these studies included 111 MDS patients IDH mutations and 1671 MDS patients with wild-type IDH1/2. The hazard ratios (HRs) of OS and LFS for patients with IDH mutations were 1.62 (95% CI, 1.27–2.09) and 2.21 (95% CI, 1.48–3.30), respectively. Conclusion The results from our study and the meta-analysis provide firm evidence that IDH mutations are significantly associated with poorer clinical outcomes in MDS. Identification of IDH mutations may be pivotal for better risk stratification in MDS patients and improving IPSS score. Additionally, hypomethylating agents may be an effective treatment option for MDS patients with IDH mutations.
Convergence or Divergence? Chinese Novice EFL Teachers’ Beliefs about Postmethod and Teaching Practices
Zhengping Zeng
English Language Teaching , 2012, DOI: 10.5539/elt.v5n10p64
Abstract: Recently, there have been numerous researches focusing on postmethod. Generally, the researches can be divided into three perspectives: a new look at method, theoretical exploration of postmethod, implication for teacher education. Obviously, language researchers tend to focus on the theoretical review on postmethod ignoring the actual use of postmethod in practice. The study was conducted to explore Chinese novice EFL teachers’ conceptions and implement of postmethod. The data were collected through lesson observations and interviews. The results reveal that the novice teachers lack the knowledge of postmethod, that they are greatly influenced by examination-oriented education, and that there is a discrepancy between teaching behaviors and teacher beliefs.
Lightweight Behavior-Based Language for Requirements Modeling  [PDF]
Zhengping Liang, Guoqing Wu, Li Wan
Journal of Software Engineering and Applications (JSEA) , 2010, DOI: 10.4236/jsea.2010.33030
Abstract: Whether or not a software system satisfies the anticipated user requirements is ultimately determined by the behaviors of the software. So it is necessary and valuable to research requirements modeling language and technique from the perspective of behavior. This paper presents a lightweight behavior based requirements modeling language BDL with formal syntax and semantics, and a general-purpose requirements description model BRM synthesizing the concepts of viewpoint and scenario. BRM is good for modeling large and complex system due to its structure is very clear. In addition, the modeling process is demonstrated through the case study On-Line Campus Management System. By lightweight formal style, BDL & BRM can effectively bridge the gap between practicability and rigorousness of formal requirements modeling language and technique.
Effect of Modulation Error on All Optical Fiber Current Transformers  [PDF]
Zhengping Wang, Yuekun Wang, Shuai Sun
Journal of Sensor Technology (JST) , 2012, DOI: 10.4236/jst.2012.24024
Abstract: For actively modulated In-line Sagnac interferential all optic fiber current transformers (AOFCTs), the accuracies are directly affected by the amplitude of the modulation signal. In order to deeply undertand the function of the modulator, a theoretical model of modulation effect to AOFCTs is built up in this paper. The effect of the amplitude of the modulation signal to the output intensity of AOFCTs is theoretically formulated and numerical calculated. The results show that the modulation voltage variation could affect the output accuracies significantly. This might be some references on the investigation for practical applications of AOFCTs.
Supply Chain Orchestration Leveraging on MNC Networks and Local Resources: Approach Strategies  [PDF]
Zhengping Li, Robert De Souza, Mark Goh
Journal of Service Science and Management (JSSM) , 2016, DOI: 10.4236/jssm.2016.94036
Abstract: Competition is becoming more global and is between the networks of businesses rather than between the firms. Operating in such an increasing networked environment, companies have to innovate their business, either be orchestrators or be orchestrated. This exploratory paper proposes an overarching Supply Chain Orchestration (SCO) framework which leverages on the capabilities of the MNC’s networks and the local Logistics Service Providers (LSPs) at a strategic level. This framework comprises integrated components including orchestrated Supply Chain Network (SCN), the relationship model of the actors, a “Win-for-All” pro-orchestration model, and the collaboration platform for the LSPs. Specifically, the paper proposes a practical approach for upgrading the local industry through a virtuous model whereby the MNCs, LSPs, and government agencies collaborate to create a pro-orchestration environment for greater value adding. Using a semi-structured interview approach, key players across the logistics sector in Singapore were interviewed. The approach strategies for realizing this orchestration are investigated and the implications are discussed through a few application scenarios.
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