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Search Results: 1 - 10 of 43169 matches for " XU Luan "
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El sistema de defensa contra cohetes balísticos de Estados Unidos
Luan Xu
Política y cultura , 2001,
Abstract:
Photophysical Property and Photocatalytic Activity of New Gd2InSbO7 and Gd2FeSbO7 Compounds under Visible Light Irradiation
Jingfei Luan,Yong Xu
International Journal of Molecular Sciences , 2013, DOI: 10.3390/ijms14010999
Abstract: Gd 2InSbO 7 and Gd 2FeSbO 7 were synthesized first, and their structural and photocatalytic properties were studied. The lattice parameters and the band gaps for Gd 2InSbO 7 and Gd 2FeSbO 7 were 10.449546 ?, 10.276026 ?, 2.897 eV and 2.151 eV. The photocatalytic degradation of rhodamine B was performed with Gd 2InSbO 7 and Gd 2FeSbO 7 under visible light irradiation. Gd 2InSbO 7 and Gd 2FeSbO 7 had higher catalytic activity compared with Bi 2InTaO 7. Gd 2FeSbO 7 exhibited higher catalytic activity than Gd 2InSbO 7. The photocatalytic degradation of rhodamine B followed with the first-order reaction kinetics, and the first-order rate constant k was 0.01606, 0.02220 or 0.00329 min ?1 with Gd 2InSbO 7, Gd 2FeSbO 7 or Bi 2InTaO 7 as photocatalyst. Complete removal of rhodamine B was observed after visible light irradiation for 225 min or 260 min with Gd 2FeSbO 7 or Gd 2InSbO 7 as photocatalyst. The evolution of CO 2 was realized, and it indicated continuous mineralization of rhodamine B during the photocatalytic process. The possible photocatalytic degradation pathway of rhodamine B was proposed.
The Enhanced Performance of C2H2 Gas Sensor based on Carbon-decorated SnO2 Nanoparticles via CVD method
Chunhong Luan,Bao Xu,Chao Wang
Physics , 2015,
Abstract: As a flammable and explosive industrial gas, C2H2 gas detection is necessary and significant. Herein, highly sensitive C2H2 gas sensor was initially fabricated by carbon-decorated SnO2 nanoparticles, which was prepared using CVD method with C2H2 Gas as raw material. The effects of preparation conditions on sensor response were studied and the response to 1000 ppm C2H2 at working temperature of 370 C reached a value of 106.3, which is much higher than that of other materials reported. In addition, the carbon-decorated SnO2 sensor showed very good stability and C2H2 selectivity against other gases. Raman spectroscopy reveals that the response of sensors is affected by carbon-loading and degree of graphitization, which depend on the CVD temperature. It is speculated that the sensor response is enhanced by electron penetration effect from internal SnO2 nanoparticles to the external carbon layer, due to Schottky Barrier formed between SnO2 nanoparticle and carbon layer.
Strong Local Non-Determinism of Sub-Fractional Brownian Motion  [PDF]
Nana Luan
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.613194
Abstract: Let \"\" be a subfractional Brownian motion in \"\" . We prove that \"\" is strongly locally nondeterministic.
Management of Symptomatic Sacral Perineural Cysts
Jianqiang Xu, Yongdong Sun, Xin Huang, Wenzhong Luan
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0039958
Abstract: Background There has been no consensus on the optimal treatment of symptomatic sacral perineural cysts. Most previous reports concerning the management methods were either sporadic case reports or a series of limited cases. This study is to further optimize the management for patients with symptomatic sacral perineural cysts by analyzing the outcomes of a cohort of patients who were treated with different strategies. Methods and Findings We reviewed the outcomes of 15 patients with symptomatic sacral perineural cysts who were managed by three different modalities from 1998 through 2010. Six patients underwent microsurgical cyst fenestration and cyst wall imbrication. Seven patients underwent a modified surgical procedure, during which the cerebrospinal fluid leak aperture was located and repaired. Two patients were treated with medication and physical therapy. Outcomes of the patients were assessed by following up (13 months to 10 years). All of the six patients treated with microsurgical cyst fenestration and cyst wall imbrication experienced complete or substantial relief of their preoperative symptoms. However, the symptoms of one patient reappeared eight months after the operation. Another patient experienced a postoperative cerebrospinal fluid leakage. Six of the seven patients treated with the modified surgical operation experienced complete or substantial resolution of their preoperative symptoms, with only one patient who experienced temporary worsening of his preoperative urine incontinence, which disappeared gradually one month later. No new postoperative neurological deficits, no cerebrospinal fluid leaks and no recurrence were observed in the seven patients. The symptoms of the two patients treated with conservative measures aggravated with time. Conclusions Microsurgical operation should be a treatment consideration in patients with symptomatic sacral perineural cysts. Furthermore, the surgical procedure with partial cyst removal and aperture repair for prevention of cerebrospinal fluid leakage seemed to be more simple and effective.
Application of satellite thermal infrared remote sensing in monitoring magmatic activity of Changbaishan Tianchi volcano
LingYun Ji,JianDong Xu,XuDong Lin,Peng Luan
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-010-3232-2
Abstract: In this paper, with the application of satellite thermal infrared remote sensing technique, nine land surface temperature distribution maps of Changbaishan Tianchi volcano area are retrieved from nine thermal infrared images which are taken from 1999 to 2008. In terms of NDVI (Normalized Difference Vegetation Index), we classify the surface cover of the study area into three types, i.e. vegetation (forest), mixture of soil and vegetation (short grasses), and bare rock. The average temperature of each type of surface covers is calculated first, and then the average daily temperature record from Tianchi meteorological station is subtracted in order to reduce the effect of weather variation. Finally, thermal anomalies of three types of surface cover in Changbaishan Tianchi volcano area in the period of 1999 to 2008 are obtained, which is believed to reflect the magmatic activity in the magma chamber under Tianchi volcano caldera. Our results indicate that temperature of the study area increased with an intermittent tendency during 1999 to 2005, but dropped after 2005, and then maintained a relatively stable state from 2006 to 2008. Such a tendency of annual temperature variation possibly caused by magmatic activity is correlated with the results observed by means of seismic monitoring, ground deformation from GPS measurement, and volcanic gas geochemistry monitoring in the same area. It is implied that the upward intrusion of magma may cause temperature increase, and such temperature variation is great enough so that could be detected by using satellite thermal infrared remote sensing technology.
QCD Matter Thermalization at RHIC and LHC
Xu, Zhe;Cheng, Luan;El, Andrej;Gallmeister, Kai;Greiner, Carsten
High Energy Physics - Phenomenology , 2008, DOI: 10.1088/0954-3899/36/6/064035
Abstract: Employing the perturbative QCD inspired parton cascade, we investigate kinetic and chemical equilibration of the partonic matter created in central heavy ion collisions at RHIC and LHC energies. Two types of initial conditions are chosen. One is generated by the model of wounded nucleons using the PYTHIA event generator and Glauber geometry. Another is considered as a color glass condensate. We show that kinetic equilibration is almost independent on the chosen initial conditions, whereas there is a sensitive dependence for chemical equilibration. The time scale of thermalization lies between 1 and 1.5 fm/c. The final parton transverse energy obtained from BAMPS calculations is compared with the RHIC data and is estimated for the LHC energy.
Compact Triple-Band Monopole Antenna for 2.4/5.2/5.8 GHz WLAN Operations
Yu-Chen Luan;Fu-Shun Zhang;Yun Xu
PIER Letters , 2012, DOI: 10.2528/PIERL12072908
Abstract: A novel compact monopole antenna with triple-band operation is proposed in this paper. The proposed antenna, fed by a 50-Ω microstrip line, consists of an inverted--shaped microstrip feed line loaded with a parasitic strip and a protrudent mirrored quasi--shaped strip on the ground plane, with a compact overall size of 20×25 mm2. The protrudent mirrored quasi--shaped strip is aimed to excite a resonant mode at 2.4 GHz. Meanwhile, with the introduction of the parasitic strip to the inverted- shaped strip, two adjacent resonant frequencies at 5.2/5.8 GHz are obtained. The numerical and experimental results exhibit the designed antenna operates over triple frequency ranges, satisfying the standards of wireless local area networks (WLAN) both in IEEE 802.11 b/a/g at 2.4-GHz, 5.2-GHz, and 5.8-GHz. Besides, the antenna is fabricated and measured, and the simulation and measurement results of the return loss, radiation patterns and peak antenna gains are studied showing that the presented antenna is in good performance.
Facile solution growth of vertically aligned ZnO nanorods sensitized with aqueous CdS and CdSe quantum dots for photovoltaic applications
Luan Chunyan,Vaneski Aleksandar,Susha Andrei,Xu Xueqing
Nanoscale Research Letters , 2011,
Abstract: Vertically aligned single crystalline ZnO nanorod arrays, approximately 3 μm in length and 50-450 nm in diameter are grown by a simple solution approach on a Zn foil substrate. CdS and CdSe colloidal quantum dots are assembled onto ZnO nanorods array using water-soluble nanocrystals capped as-synthesized with a short-chain bifuncional linker thioglycolic acid. The solar cells co-sensitized with both CdS and CdSe quantum dots demonstrate superior efficiency compared with the cells using only one type of quantum dots. A thin Al2O3 layer deposited prior to quantum dot anchoring successfully acts as a barrier inhibiting electron recombination at the Zn/ZnO/electrolyte interface, resulting in power conversion efficiency of approximately 1% with an improved fill factor of 0.55. The in situ growth of ZnO nanorod arrays in a solution containing CdSe quantum dots provides better contact between two materials resulting in enhanced open circuit voltage.
Research on Dynamic Pricing Between High Speed Rail and Air Transport Under the Influence of Induced Passenger Flow
Zhang Xu,Luan Weixin,Cai Quande,Zhao Bingru
Information Technology Journal , 2012,
Abstract: This study first briefly describes the application of game theory and Changes arising from the combination of ticket price changes in passenger traffic to the dynamic pricing between high speed rail and air, selects Stackelberg model to describe the process of dynamic pricing process, then establishes multilayer planning dynamic pricing model between high speed rail and air transport with the thinking of bilevel programming model and calculated the constructed model ions with practical examples based on the heuristic algorithm of sensitivity analysis. With the analysis of the competition game pricing process between high speed rail and air transport, a conclusion under the influence of passenger has been drawn, that is high speed rail tends to balance ticket prices range in [38.8,39] and air transport tends to balance the ticket price range in [55.5,56]. Finally, this study systematically analyzes the passenger flow and the changes of profits in the game process of the pricing competition between high speed rail and air transport.
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