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Search Results: 1 - 10 of 152800 matches for " Shi Lei Li "
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Extraosseous Ewing's sarcoma arising from the pterygomandibular space  [PDF]
Wei Li, Jian Tao Huang, Xiao Qing Chen, Rong Hua Shi, Lei Jiang, Yun Fu Zhao
Open Journal of Stomatology (OJST) , 2011, DOI: 10.4236/ojst.2011.13018
Abstract: Extraosseous Ewing’s sarcoma (EES) arising in head and neck is extremely rare. We report on a rare case of EES originating from the pterygomandibular space. A 15-year-old boy was seen with a rapidly growing mass in the right upper neck, difficulty in opening mouth, dysphagia, numbness in the right lower lip and buccal skin. Clinical and radiological examinations indicated that a soft tissue mass origi-nated from the pterygomandibular space with the submandibular space and mouth floor extension. Histological and immunohistochemical evaluations of the biopsy specimen revealed poorly differentiated small blue round cells with positive stains for CD99 and neuron-specific enolase. According to the clinical manifestation, CT and MRI findings, histological pattern and the results of the immunohistochemical studies, the final diagnosis was EES. Our patient was treated with chemotherapy and radiotherapy. The lesion recurred locally after 10 months and he died of multiple distant metastases 22 months later. Early and confident diagnosis coupled with combined surgical excision and modern chemotherapy/radiotherapy appears to be the most effective treatment plan.
[2-Amino-4,6-bis(2-pyridyl)-1,3,5-triazine-κ3N4,N5,N6]dichloridocadmium(II)
Man-Li Cao,Lei Shi
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811012517
Abstract: In the title compound, [CdCl2(C13H10N6)], the 2-amino-4,6-bis(pyridin-2-yl)-1,3,5-triazine (HABPT) ligand adopts a tridentate tripyridyl coordination mode. The CdII atom is five-coordinated by three N atoms from the HABPT ligand and two chloride ions. In the crystal, molecules are linked via N—H...N, N—H...Cl and C—H...Cl hydrogen bonds into a supramolecular network.
Magnetic Method Surveying and Its Application for the Concealed Ore-Bodies Prospecting of Laba Porphyry Molybdenum Ore Field in Shangri-La, Northwestern Yunnan Province, China  [PDF]
Nguyen Ba Dai, Chuan Dong Xue, Kun Xiang, Kun Xiang, Tran Trong Lap, Qureshi Javed Akhter, Shi Lei Li
Journal of Geoscience and Environment Protection (GEP) , 2014, DOI: 10.4236/gep.2014.23006
Abstract:

Recently, a number of large molybdenum (-copper) deposits have been discovered successively in the Laba area, Shangri-La county, northwestern Yunnan province. The investigation confirmed that there is a superlarge porphyry-skarn hydrothermal vein type molybdenum-polymetallic- metallogenic system with the total prediction reservoir of more than 150 mt molybdenum. The porphyry intrusions contributed to the mineralization closely, the superficial little vein molybdenum (-copper, lead, silver) ore-bodies are usually located in faults and fractures, and the deep porphyry type ore-bodies occurred in the granodiorite porphyries, the skarn type ore-bodies occurred in the contact zone intrused into Triassic limestone or Permian basalts. Laba ore block is a new exploration area with great prospecting potential. In order to reduce the target area and guide the further exploration work, the magnetic method measurement about 3.3 square kilometres was carried out in the ore field. This paper presents an application of analyzing the horizontal and vertical derivative, using Fast Fourier Transform (FFT) filter (FFT high-pass, low-pass, cosine roll-off, suscepbility), calculated spectra frequency energy to predict the depth and intensity of the apparent remanence magnetization of source (Hilbert). The calculated results and magnetic anomalous show that the remanence anomaly is caused by the intrusions into the Triassic limestone and Permian basalts with small anomalies, and the depth of located source is not great. We have identified a number of positions to the three drilled well, the drilled result specify interpretation with very high accuracy. The magnetic method is helpful to identify porphyry mineralization, and judge the shape and depth of the concealed ore-bearing intrusive bodies under the similar geological condition.

An External Calibration Method for Compensating for the Mutual Coupling Effect in Large Interferometric Aperture Synthesis Radiometers
Jian Dong,Ronghua Shi,Ke Chen,Qingxia Li,Wentai Lei
International Journal of Antennas and Propagation , 2011, DOI: 10.1155/2011/937261
Abstract: This paper deals with the antenna mutual coupling effect in interferometric aperture synthesis radiometers (IASRs), which degrades the system radiometric performance. First, the conventional mutual impedance (CMI) is adopted to analyze the mutual coupling effect on the performance of IASR and a practical model of the coupled visibilities is developed. Based on the model, an external calibration method is then proposed to compensate for the mutual coupling effect. In this method, the measured visibilities are decoupled through the difference measurement between the original scene and a naturally occurring reference scene. Compared to the previous methods, the proposed method requires no extra additional hardware cost and has easier implementation and, therefore, fits for the large interferometric array radiometers. Experimental results validate the effectiveness of the proposed method. 1. Introduction Interferometric aperture synthesis technique, first used in the radio astronomy community [1], has been introduced into passive microwave remote sensing of the Earth with high spatial resolution since the 1980s [2–5]. In an aperture synthesis microwave radiometer, a large antenna aperture can be synthesized by sparsely arranging a number of small aperture antennas and measuring the coherent product (cross correlation) of the signals collected from pairs of antennas at various spacings. The avoidance of the very large and massive mechanical scanning antenna is the main advantage of an aperture synthesis radiometer compared to a conventional real aperture radiometer [6]. However, the use of a number of small aperture antennas may introduce some system radiometric errors and degrade the system radiometric accuracy because of antenna imperfections such as the antenna mutual coupling, antenna pattern ripples, and antenna position errors [7]. Thus, accurate characterization and effective compensation of antenna imperfections is one of the important factors to consider in the design of ISAR. In this paper, the antenna mutual coupling effect will be mainly addressed. In some interferometric radiometry fields, that is, radio astronomy, the effect of antenna mutual coupling is usually negligible due to the very directive antennas and the very large distance between the antennas. On the other hand, interferometric radiometers for Earth observation require closely spaced antennas with a large half-power beamwidth to deal with the large field of view (FOV) without imaging aliasing. In this case, the effect of antenna mutual coupling is a main source of system
α-Linolenic acid prevents endoplasmic reticulum stress-mediated apoptosis of stearic acid lipotoxicity on primary rat hepatocytes
Yong Zhang, Lei Dong, Xia Yang, Hongyang Shi, Li Zhang
Lipids in Health and Disease , 2011, DOI: 10.1186/1476-511x-10-81
Abstract: Cell viability was investigated using MTT assay, and apoptosis was evaluated with Hoechst 33342 staining. Western blot analysis was used to examine the changes in the expression levels of glucose regulated protein 78 (GRP78), glucose regulated protein 94 (GRP94), and C/EBP homologous protein (CHOP). Caspase-3 activity was evaluated using a Caspase-3 substrate kit.We have studied the ability of α-linolenic acid to prevent endoplasmic reticulum stress-mediated apoptosis of rat hepatocytes elicited by stearic acid and thapsigargin. Incubation of primary rat hepatocytes for 16 h with stearic acid produced a significant increase in cell death. Stearic acid also increased levels of three indicators of ER stress -- GRP78, CHOP, and GRP94. α-Linolenic acid distinctly reduced cell death and levels of all three indicators of ER stress brought about by stearic acid. Thapsigargin, which induces ER stress produced similar effects to those obtained using stearic acid; its effects were partly reversed by α-linolenic acid.These results suggest that α-linolenic acid prevents ER stress-mediated apoptosis of stearic acid lipotoxicity on primary rat hepatocytes might become a target to develop new antiapoptotic compounds in nonalcoholic fatty liver disease (NAFLD).The endoplasmic reticulum (ER) is a subcellular organelle where the vast majority of secreted and membrane proteins are folded. Many kinds of cellular perturbations, such as imbalances in calcium, loss of the luminal oxidizing environment and/or nutrient homeostasis, can lead to the accumulation of unfolded proteins and apoptosis[1,2]. The apoptosis is involved in the pathogenesis of many diseases and conditions including ischemia-reperfusion injury, diabetes and nonalcoholic fatty liver disease (NAFLD) [3,4].Hepatocyte death is a main feature of almost every liver disease, with apoptosis characterized by biochemical and morphological features being one of its modes. Over the past ten years, thapsigargin (TG), has become wide
Asymmetric interaction will facilitate the evolution of cooperation
RuiWu Wang,JunZhou He,YaQiang Wang,Lei Shi,YaoTang Li
Science China Life Sciences , 2010, DOI: 10.1007/s11427-010-4016-2
Abstract: Explaining the evolution of cooperation remains one of the greatest problems for both biology and social science. The classical theories of cooperation suggest that cooperation equilibrium or evolutionary stable strategy between partners can be maintained through genetic similarity or reciprocity relatedness. These classical theories are based on an assumption that partners interact symmetrically with equal payoffs in a game of cooperation interaction. However, the payoff between partners is usually not equal and therefore they often interact asymmetrically in real cooperative systems. With the Hawk-Dove model, we find that the probability of cooperation between cooperative partners will depend closely on the payoff ratio. The higher the payoff ratio between recipients and cooperative actors, the greater will be the probability of cooperation interaction between involved partners. The greatest probability of conflict between cooperative partners will occur when the payoff between partners is equal. The results show that this asymmetric relationship is one of the key dynamics of the evolution of cooperation, and that pure cooperation strategy (i.e., Nash equilibrium) does not exist in asymmetrical cooperation systems, which well explains the direct conflict observed in almost all of the well documented cooperation systems. The model developed here shows that the cost-to-benefit ratio of cooperation is also negatively correlated with the probability of cooperation interaction. A smaller cost-to-benefit ratio of cooperation might be created by the limited dispersal ability or exit cost of the partners involved, and it will make the punishment of the non-cooperative individuals by the recipient more credible, and therefore make it more possible to maintain stable cooperation interaction.
Persistent organic pollutants PCNs and PBDEs in sediments from coastal waters of Qingdao, Shandong Peninsula
Yongliang Yang,Jing Pan,Yue Li,Xiaocai Yin,Lei Shi
Chinese Science Bulletin , 2004, DOI: 10.1007/BF02901749
Abstract: Thirty-one congeners of polychlorinated naphthalenes (PCNs) and 21 congeners of polybrominated diphenylethers (PBDEs)in surface sediments at 5 stations and one mussel sample from Qingdao coastal waters were analyzed. The maximum contents occur at the station near the Haibo River mouth. The total PCNs contents are in the range of 212–1209 pg/g dw, dominated by tri-Cl CN. The total PBDEs contents are in the range of 117–5510 pg/g dw, dominated by tri-to hexa-BrBDEs. The local sources of PCNs are likely from combustion processes such as incinerations and coal burnings. The sources of PBDEs are molecular diffusion from the materials containing them. Except for the area near the river mouth where is affected by the sewage sludges, an important source of PCNs and PBDEs in this area is believed to be the atmospheric deposition. Mussels enrich PCNs and PBDEs relative to the sediments. The total TEQs of PCNs in mussels are lower than the total TEQs of PCBs.
Concentration and angular velocity measurement in a cyclone separator dipleg using electrical capacitance tomography
Meng Sun,Shi Liu,Jing Lei,ZhiHong Li
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-008-0323-4
Abstract: Cyclone separator is one of the main parts of the circulating fluidized bed (CFB) boiler. The separation efficiency of the cyclone separator is very important to the whole boiler. Electrical capacitance tomography (ECT) is a unique measuring technique with great potential in multiphase flow measurement. Experimental studies are carried out on the measurement of volumetric concentration and angular velocity using ECT. The former is determined through image reconstruction method, and the latter is measured by cross-correlating the capacitance fluctuations caused by the conveyed solids. The distribution of void fraction in radial direction, the fluctuating characteristics, probability density function and the spectrum characteristics are analyzed. The feasibility and reliability of the method are verified by experimental results.
Three-stage aged refuse biofilter for the treatment of landfill leachate

LI Hongjiang,ZHAO Youcai,SHI Lei,GU Yingying,

环境科学学报(英文版) , 2009,
Abstract: A field-scale aged refuse (AR) biofilter constructed in Shanghai Refuse Landfill, containing about 7 000 m3 aged refuse inside, was evaluated for its performance in the treatment of landfill leachate. This AR biofilter can be divided into three stages and can manage 50 m3 landfill leachate per day. The physical, chemical, and biological characteristics of AR were analyzed for evaluating the AR biofilter as leachate treatment host. The results revealed that over 87.8%--96.2% of COD and 96.9%--99.4% of ammonia nitrogen were removed by the three-stage AR biofilter when the influent leachate COD and ammonia nitrogen were 5 478-10 842 mg/L and 811-1 582 mg/L, respectively. The final effluent was inodorous and pale yellow with COD and ammonia nitrogen below 267--1,020 mg/L and 6--45 mg/L, respectively. The three-stage AR biofilter had efficient nitrification but relative poor denitrification capacity with a total nitrogen (TN) removal of 58%--73%. The external temperature of AR biofilter did not influence the total ammonia nitrogen removal significantly. It was concluded that the scale-up AR biofilter can work very well and can be a promising technology for the treatment of landfill leachate.
Characteristic of Plasma Sheath Channel and its Effect on Communication
Lei Shi;Baolong Guo;Yanming Liu;Jiangting Li
PIER , 2012, DOI: 10.2528/PIER11110201
Abstract: The plasma sheath communication blackout issue for hypersonic or reentry vehicles is addressed from a channel characteristic perspective. Different from previous research, this paper emphasizes the importance of plasma sheath channel in the study of plasma communication blackout, and the discussion on transmission and phase shift characteristic of plasma sheath channel and their effect on communication performance was made with detail. A mathematical plasma sheath channel model is proposed and following the roadmap about how to obtain channel characteristic parameter is given. Flow field simulation of a blunt conical body physical was made, and the electron density and collision frequency profile got from flow field result under different incident angle at Mach 10-20 are presented thoroughly. The performance for QPSK based communication system under the established plasma channel is evaluated finally. It is indicated in our research that channel attenuation feature variation regularity is consistent with that of incident wave or Mach number, but the phase shift variation regularity with incident frequency or Mach number appears fall into chaos because of multiple 360 degree removal of original phase shift from communication view and complicated ratio relationships among incident wave, plasma frequency and collision frequency. Communication simulations result show that bit error rate agree with phase shift chaos well and phase shift exert large influence on present typical racking, telemetry, and command system. Some useful implications obtained from this study to improve communication performance include high frequency, high power and further rapid acquisition/tracing phase-locked loop compensating large phase shift.
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