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Search Results: 1 - 10 of 34688 matches for " Kun Zhu "
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A feasibility study on cleaning Pb-contaminated soil with chelating agents
Zhu Kun,
Zhu Kun
,Chen Hui

环境科学学报(英文版) , 1994,
Abstract: In this paper, the complexing abilities of EDTA, TTHA and Cit. with lead in the Pb(2.59 mg/g) contaminated soil were compared in the laboratory. Possibilities for lead and the threeagents to develop stable complexes increased proportionally to the growth of lead complexible formwhen the PH values ranged between 4 and 6. Under acid conditions, logB_(Pb-TTHA)) valued as 28.1 wasmuch higher than logB_(Pb-EDTA), as 18.0 depending on producing Pb_2-TTHA (logK_(Pb_2-TTHA= 11 0) andPb-HTTHA (logK(Pb-HTTTHA)=8.2)). Conclusively, the complexing ability of TTHA with Pb still ex-aseded that of EDTA by about 10% even when the amount of TTHA added was only equal to onefourth of that of EDTA. Due to the lower cost and less harzn to crops, Cit. can still be taken as abetter chelating agent in acid soil although its coordinative capability with Pb was weaker thanEDTA and TTHA.
Virtualization of 5G Cellular Networks as a Hierarchical Combinatorial Auction
Kun Zhu,Ekram Hossain
Computer Science , 2015,
Abstract: Virtualization has been seen as one of the main evolution trends in the forthcoming fifth generation (5G) cellular networks which enables the decoupling of infrastructure from the services it provides. In this case, the roles of infrastructure providers (InPs) and mobile virtual network operators (MVNOs) can be logically separated and the resources (e.g., subchannels, power, and antennas) of a base station owned by an InP can be transparently shared by multiple MVNOs, while each MVNO virtually owns the entire BS. Naturally, the issue of resource allocation arises. In particular, the InP is required to abstract the physical resources into isolated slices for each MVNO who then allocates the resources within the slice to its subscribed users. In this paper, we aim to address this two-level hierarchical resource allocation problem while satisfying the requirements of efficient resource allocation, strict inter-slice isolation, and the ability of intra-slice customization. To this end, we design a hierarchical combinatorial auction mechanism, based on which a truthful and sub-efficient resource allocation framework is provided. Specifically, winner determination problems (WDPs) are formulated for the InP and MVNOs, and computationally tractable algorithms are proposed to solve these WDPs. Also, pricing schemes are designed to ensure incentive compatibility. The designed mechanism can achieve social efficiency in each level even if each party involved acts selfishly. Numerical results show the effectiveness of the proposed scheme.
Esophageal Cancer Patients with Less Lymph Node Dissection May Have Better Prognosis  [PDF]
Hannan Wang, Yong Jia, Chengxue Dang, Kun Zhu, Kang Li
Journal of Biosciences and Medicines (JBM) , 2016, DOI: 10.4236/jbm.2016.47006
Abstract: Background: China is a high incidence area of esophageal cancer. Esophageal squamous cell carcinoma recurrence and mortality rates are relatively high. Recent studies show that the recurrence rate remains very high even through the implementation of lymph node expanding dissection. Methods and Results: In order to study the relationship between lymph node dissection number and survival of the patients with esophageal squamous cell carcinoma, 407 cases of esophageal cancer are selected in the First Affiliated Hospital of Xi’an Jiaotong University from January 2009 to June 2013. There were 15 cases without surgery, while the rest of the 392 patients were post-operation in follow-up. 54 patients were lost in follow-up, and the rate was 13.8%. Finally, there were 338 patients entered into our research. The median age was 58 (37 - 81), males accounted for 79%. The number of lymph node dissection is for a total of 2091, and a median of 5. Positive lymph nodes are 400, while the total positive rate is 19.1%. Conclusion: The number of lymph node dissection is divided into 3 groups that are 0 to 6, 7 to 11, 12 or more into three grades, and reduced number of lymph node dissection may prolong the survival (P < 0.05). The number of lymph node dissection should be as less as possible unless there is definitely positive lymph node metastasis.
Evolution, Achievements, and Challenges for New Cooperative Medical Schemes in Rural China  [PDF]
Kun Zhu, Xiaojuan Zhang, Shasha Yuan, Miaomiao Tian
Modern Economy (ME) , 2016, DOI: 10.4236/me.2016.713140
Abstract: Objectives: To describe the development of NCMS in the past decade including three sections and to bring up relevant policy implications. Methods: Based on secondary data and literature review, the evolution and achievement of NCMS in the past decade and the expected future challenges were analyzed. Results: Impressive advances have been seen in establishing the largest medical insurance system, New Cooperative Medical Scheme (NCMS), covered more than 800 million farmers in rural China during the past decade. Remarkable achievements during the development of NCMS include universal health coverage among rural residents, rapid increasing premium, balanced pooling fund, improved service, cost and coverage of farmers, and a strengthened primary health care system. In the meantime, the NCMS also confronted certain challenges: Institutionalization and legalization lagged behind the development of NCMS; payment reform failed to control the rapid growth of medical expenditure and financial protection for enrollees was insufficient; solidarity and equity between NCMS and other medical insurance systems is still an issue that needs to be solved; sustainable financing mechanism was not established successfully and moreover, it was also not compatible with the aging population and epidemiological transition of rural China; double coverage for rural residents turned up as portability was not achieved.
Matroidal Structure of Rough Sets from the Viewpoint of Graph Theory
Jianguo Tang,Kun She,William Zhu
Journal of Applied Mathematics , 2012, DOI: 10.1155/2012/973920
Abstract: Constructing structures with other mathematical theories is an important research field of rough sets. As one mathematical theory on sets, matroids possess a sophisticated structure. This paper builds a bridge between rough sets and matroids and establishes the matroidal structure of rough sets. In order to understand intuitively the relationships between these two theories, we study this problem from the viewpoint of graph theory. Therefore, any partition of the universe can be represented by a family of complete graphs or cycles. Then two different kinds of matroids are constructed and some matroidal characteristics of them are discussed, respectively. The lower and the upper approximations are formulated with these matroidal characteristics. Some new properties, which have not been found in rough sets, are obtained. Furthermore, by defining the concept of lower approximation number, the rank function of some subset of the universe and the approximations of the subset are connected. Finally, the relationships between the two types of matroids are discussed, and the result shows that they are just dual matroids.
Overlap digraph: An effective model for finding good spaced seeds for biological sequence local alignment
Ke Chen,Kun She,QingXin Zhu
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-010-4161-9
Abstract: Spaced seeds technology, which was proposed by PatternHunter, has been proven to be more sensitive and faster than continuous seeds, and it is now widely used for bio-sequence local alignments. However, finding optimal spaced seeds is an NP-hard problem. A seed digraph model is proposed to find good spaced seeds, which are very close to optimal, in a very different but effective way. Using this different approach, some good long spaced seeds which cannot be calculated by normal optimal sensitivity formulas due to their exponential complexity can be found.
Supersymmetry Breaking in Anti-de Sitter spacetime
Zhu, Bin;Meng, Kun;Ding, Ran
High Energy Physics - Phenomenology , 2013,
Abstract: We study the questions of how supersymmetry is spontaneously broken in Anti de-Sitter spacetime. We verify that the would-be R-symmetry in $AdS_4$ plays a central role for the existence of meta-stable supersymmetry breaking. To illustrate, some well-known models such as Poloyni models and O'Raifeartaigh models are investigated in detail. Our calculations are reliable in flat spacetime limit and confirm us that meta-stable vacua are generic even though quantum corrections are taken into account.
Quark Fragmentation Functions in Low-Energy Chiral Theory
Xiangdong Ji,Zheng-Kun Zhu
Physics , 1994,
Abstract: We examine the physics content of fragmentation functions for inclusive hadron production in a quark jet and argue that it can be calculated in low energy effective theories. As an example, we present a calculation of $u$-quark fragmentation to $\pi^+$ and $\pi^-$ mesons in the lowest order in the chiral quark model. The comparison between our result and experimental data is encouraging.
Discrete unified gas kinetic scheme on unstructured meshes
Lianhua Zhu,Zhaoli Guo,Kun Xu
Physics , 2015,
Abstract: The recently proposed discrete unified gas kinetic scheme (DUGKS) is a finite volume method for deterministic solution of the Boltzmann model equation with asymptotic preserving property. In DUGKS, the numerical flux of the distribution function is determined from a local numerical solution of the Boltzmann model equation using an unsplitting approach. The time step and mesh resolution are not restricted by the molecular collision time and mean free path. To demonstrate the capacity of DUGKS in practical problems, this paper extends the DUGKS to arbitrary unstructured meshes. Several tests of both internal and external flows are performed, which include the cavity flow ranging from continuum to free molecular regimes, a multiscale flow between two connected cavities with a pressure ratio of 10000, and a high speed flow over a cylinder in slip and transitional regimes. The numerical results demonstrate the effectiveness of the DUGKS in simulating multiscale flow problems.
Study of prediction for groundwater contamination in wastewater land treatment system
Liu Zhaochang,Liu Xiang,Zhu Kun,
Liu Zhaochang
,Liu Xiang,Zhu Kun

环境科学学报(英文版) , 1992,
Abstract: This paper uses a prediction model of groundwater pollution based on the experiments in the laboratory and in field .The model, which was tested and calibrated by the field observated data ,satisfactorily simulated the field conditions in land treatment system of wastewater . Particularly , the model can provide the reliable pollution prediction of heavy metals , organisms and nitrogen . The model was used to predict the groundwater pollution caused by the land treatment system in the region of North China . The calibration of the model showed that correlation coefficients between the tested and predictive data of Cr6+. As3+, organism and NH4+ could reach 0.990, which proved that the model possessed the realistic instructive significance for design and use of wastewater land treatment systems .
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