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Search Results: 1 - 10 of 88918 matches for " Long Liu "
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Preventive effects of a sachet of Chinese herbs on influenza and its immune regulation
Long Liu
Zhong Xi Yi Jie He Xue Bao , 2010,
Abstract: Objective: To study the clinical efficacy of Pihui Fanggan Sachet (PHFGS), a sachet of traditional Chinese herbs, in preventing influenza and its immune regulation on mice.Methods: In clinical study, 239 children from Shanghai Baoshan Xubeihong Art Kindergarten were randomly divided into two groups according to different class; 118 children were treated with PHFGS for 45 days as treatment group and 121 children were as blank control. During the observation period, the incidence rate of influenza, the course of disease and the severity of symptoms were recorded. In experimental study, 40 Kunming mice were randomly divided into normal control group (normal mice treated or not treated with PHFGS), and immunocompromised group (immunocompromised mice treated or not treated with PHFGS). Immunocompromise was induced by intraperitoneal injection of 80 mg/kg cyclophosphamide for 3 days. Some mice in the normal control and immunocompromised groups were then treated with extracted solution of PHFGS through nasal cavity for one week. Spleen index, content of CD3+ T cells and CD4+ T cells, CD4+/CD8+ratio, activity of natural killer (NK) cells, serum level of interferon γ (INF-γ) and respiratory level of secretory immunoglobulin A (SIgA) were evaluated.Results: The incidence rate of influenza in the treatment group was much lower than that in the blank control group (P<0.01), and the average course was shortened as compared with the control group (P<0.01). The fever, rhinocleisis, runny nose, and throat congestion in the treatment group were improved as compared with the blank control group (P<0.05, P<0.01). After injection of cyclophosphamide, the spleen index, content of CD3+T cells and CD4+T cells, CD4+/CD8+ ratio, activity of NK cells, serum level of INF-γ and respiratory level of SIgA in the immunocompromised group were significantly lower than those in the normal control group (P<0.05 or P<0.01), which indicated the immunosuppression. After treated with PHFGS for one week, the spleen index and the respiratory level of SIgA in the immunocompromised group were improved significantly. Although the content of CD3+ T cells and CD4+ T cells, CD4+/CD8+ ratio and the serum level of INF-γ were improved, the differences did not reach the significant level. No significant effects on immune function of normal mice were observed.Conclusion: PHFGS can prevent influenza effectively by improving the immunity, especially the respiratory mucosal immune function.
Energy from Combustion of Rice Straw: Status and Challenges to China  [PDF]
Zhiqiang Liu, Aixiang Xu, Bin Long
Energy and Power Engineering (EPE) , 2011, DOI: 10.4236/epe.2011.33040
Abstract: As the biggest agricultural country, China has an abundant rice straw energy resource. The characteristics of typical china rice straws are presented as high moisture contents, high volatile contents, high ash contents and low bulk density. At present, rice straw is mainly used as fuel, feedstuff, fertilizer and industrial raw material. With improved living conditions in rural areas, farmers tend to rely more on commercial fuel, which leads to even more open field burning of rice straw, and brings air pollutions and potential energy waste as well. The Chinese government is studying relevant policies on acceleration of comprehensive utilization of rice straw with the goal of utilization rate exceeding 80% in 2015. In this paper, focus is on the combustion of rice straw to extract energy, and related challenges face to china is put forward in this paper also.
OFDMA Uplink Frequency Offset Estimation with Multi-Access Interference Mitigation  [PDF]
Zhongshan Zhang, Jian Liu, Keping Long
Communications and Network (CN) , 2012, DOI: 10.4236/cn.2012.43025
Abstract: In this paper, we consider the frequency offset estimation for Orthogonal Frequency-Division Multiple Access (OF-DMA) uplink (UL) transmissions. We first analyze the negative effect of Multi-Access-Interference (MAI) on OFDMA UL, and then propose two interference reduction/elimination methods, i.e., the Reduced-Rank-Projector (RRP) and Shift-Sampling-Projector (SSP) methods, to eliminate/reduce the heavy MAI due to the frequency offsets. Finally, we propose a new training sequence group named the Round-Robin Training Sequence Group (RRTSG), which has a high interference mitigation capabilities for OFDMA UL transmission. The Cramer-Rao Lower Bound (CRLB) for an unbiased frequency offset estimator in a Multiple Access (MA) system is also derived. Numerical results show that the proposed methods are suitable to eliminate/mitigate the effect of the frequency offset on OFDMA UL transmission.
Research on Motion Attention Fusion Model-Based Video Target Detection and Extraction of Global Motion Scene  [PDF]
Long Liu, Boyang Fan, Jing Zhao
Journal of Signal and Information Processing (JSIP) , 2013, DOI: 10.4236/jsip.2013.43B006
Abstract:

For target detection algorithm under global motion scene, this paper suggests a target detection algorithm based on motion attention fusion model. Firstly, the motion vector field is pre-processed by accumulation and median filter; Then, according to the temporal and spatial character of motion vector, the attention fusion model is defined, which is used to detect moving target; Lastly, the edge of video moving target is made exactly by morphologic operation and edge tracking algorithm. The experimental results of different global motion video sequences show the proposed algorithm has a better veracity and speedup than other algorithm.

Isolation and characterization of polymorphic microsatellite loci for the valuable medicinal plant Astragalus mongholicus  [PDF]
Ao Wang, Wujisguleng Wujisguleng, Yujing Liu, Yue Liu, Chunlin Long
Open Journal of Genetics (OJGen) , 2013, DOI: 10.4236/ojgen.2013.32011
Abstract:

Astragalus mongholicus (Fabaceae) is a perennial herb and a widely used medicinal plant in traditional Chinese medicine (TCM) known as Radix Astragali (Huangqi). It was reported to have hepatoprotective, cardioprotective, antidiabetic, antiaging, sedative and immunopotentiating effects, and could also be used as an adjuvant medicine during cancer therapy. Until now, there is only a little research on its population genetics and no report on development of microsatellite loci for this plant. In this study, a microsatellite-enriched genomic DNA library of A. mongholicus was developed and screened to identify marker loci. Ten polymorphic loci were isolated and analyzed by screening 30 individuals. The number of alleles per locus ranged from 4 to 19, with an average of 12.3 alleles per locus. The observed heterozygosity (HO) and the expected heterozygosity (HE) ranged from 0.367 to 1.000 and from 0.395 to 0.912, respectively. The polymorphism information content (PIC) varied from 0.361 to 0.888, with an average of 0.762. This is the first report on characterization of microsatellite loci for A. mongholicus, and these markers will be useful for population genetics and molecular ecology studies of this plant.

Flow-Induced Vibration Analysis of Supported Pipes Conveying Pulsating Fluid Using Precise Integration Method
Long Liu,Fuzhen Xuan
Mathematical Problems in Engineering , 2010, DOI: 10.1155/2010/806475
Abstract: Dynamic analysis of supported pipes conveying pulsating fluid is investigated in Hamiltonian system using precise integration method (PIM). First, symplectic canonical equations of supported pipes are deduced with state variable vectors composed of displacement and momentum. Then, PIM with linear interpolation formula is proposed to solve these equations. Finally, this approach's precision is testified by several numerical examples of pinned-pinned pipes with different fluid velocities and frequencies. The results show that PIM is an efficient and rapid approach for flow-induced dynamic analysis o f supported pipes. 1. Introduction As the pipes are widely used in many industrial fields, flow-induced vibration analysis of pipes conveying fluid has been one of the attractive subjects in structural dynamics. It is well known that pipeline systems may undergo divergence and flutter types of instabilities generated by fluid-structure interaction. Over the last sixty years, extensive studies have been carried out on dynamic analysis of pipeline systems subject to different boundary conditions and loadings. Notable contributions in this area include the works of Chen [1] and Paidoussis [2, 3]. At present, most of the research is concentrated on nonlinear dynamic analysis of pipes conveying pulsating fluid. A recent survey on bifurcations for supported pipes can be found in [4]. Folley and Bajaj [5] considered nonlinear spatial dynamic characteristics of cantilever pipes conveying fluid. In most cases, the corresponding ordinary differential motion equations of fluid-conveyed pipes are deduced using Galerkin’s method in Lagrange system. Then many numerical methods, such as transfer matrix method, finite element method, perturbation method, Runge-Kutta method, and differential quadrature method, are applied to solve these equations. For example, Jensen [6] analyzed dynamic behaviors of vibrating pipe containing fluid subject to lateral resonant base excitation using the perturbation method of multiple scales. Yang et al. [7] investigated the effect of fluid viscosity and mass ratio on instability regions of a Kelvin-type viscoelastic pipe conveying harmonically pulsating fluid using multiple scales method. Wang et al. [8] studied the nonlinear dynamics of curved fluid conveying pipe with differential quadrature method. Jeong et al. [9] proposed a finite element model of pipes conveying periodically pulsating fluid and analyzed the influence of fluid velocities on pipe's stability. Stangl et al. [10] solved the extended version of Lagrange nonlinear equations for
Current Mathematical Methods Used in QSAR/QSPR Studies
Peixun Liu,Wei Long
International Journal of Molecular Sciences , 2009, DOI: 10.3390/ijms10051978
Abstract: This paper gives an overview of the mathematical methods currently used in quantitative structure-activity/property relationship (QASR/QSPR) studies. Recently, the mathematical methods applied to the regression of QASR/QSPR models are developing very fast, and new methods, such as Gene Expression Programming (GEP), Project Pursuit Regression (PPR) and Local Lazy Regression (LLR) have appeared on the QASR/QSPR stage. At the same time, the earlier methods, including Multiple Linear Regression (MLR), Partial Least Squares (PLS), Neural Networks (NN), Support Vector Machine (SVM) and so on, are being upgraded to improve their performance in QASR/QSPR studies. These new and upgraded methods and algorithms are described in detail, and their advantages and disadvantages are evaluated and discussed, to show their application potential in QASR/QSPR studies in the future.
An optimal increasing estimate of the iterated Maslov-type indices
Chungen Liu,Yiming Long
Chinese Science Bulletin , 1998, DOI: 10.1007/BF02883073
Abstract: An optimal increasing estimate of the Maslov-type index theory for iterations is proved.
The Centrality of Actors and Interfaces in the Understanding of New Ruralities: A Chinese Case Study
Norman Long,Jinlong Liu
Journal of Current Chinese Affairs , 2009,
Abstract: This paper aims to demonstrate the advantages of adopting an ethnographic, actor interface approach to understanding the ongoing dynamics of rural development and policy intervention processes. It does so through the discussion of an EU-funded project orientated to introducing village-level forest-management practices in north-west China. The case highlights the ongoing everyday struggles over livelihoods and resources and focuses on the negotiations that take place between the various social actors involved. The case analysis is preceded by a broad-sweep overview of the rise of new ruralities and a discussion of the key elements of an actor interface analysis. The article concludes with a call for more cross-country and cross-regional studies of this kind.
Dynamic Scenes Implementation for Radio Detector Echo Simulator
Lu Zhaogan,Liu Long
Information Technology Journal , 2012,
Abstract: Up to now, the dynamic scene echo simulator for radio detector is still difficult to implementation with computer simulation. In this report, one dynamic scene implementation scheme was presented which was based on the radio detector scene models constructed by 3ds Max (3D studio Max) 2010. The idea is that the scene could be set up with more geometric data, material properties and other auxiliary information. Then, the scene must be converted into geometric data files and VRML 97 format files. The two file are actually the data version and VRML version and could be used separately from 3ds Max 2010. Thus, they could be integrated into the simulator constructed by our research project. During the simulation progress, the objects in the scene could have different location and movement states. And, these location and movement information could be updated timely in the geometric data files and VRML 97 scenes. Thus, the dynamic scene could be displayed by most VRML 97 browsers when the simulation last for a period time. At last, the echo simulator of radio detector verified the dynamic scene.
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